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תחילת זמן קריאת שמע של ערבית

מֵאֵימָתַי קוֹרִין אֶת שְׁמַע בָּעֲרָבִין? מִשָּׁעָה שֶׁהַכֹּהֲנִים נִכְנָסִים לֶאֱכוֹל בִּתְרוּמָתָן.

The beginning of tractate Berakhot, the first tractate in the first of the six orders of Mishna, opens with a discussion of the recitation of Shema, as the recitation of Shema encompasses an acceptance of the yoke of Heaven and of the mitzvot, and as such, forms the basis for all subsequent teachings. The Mishna opens with the laws regarding the appropriate time to recite Shema:

MISHNA: From when, that is, from what time, does one recite Shema in the evening? From the time when the priests enter to partake of their teruma. Until when does the time for the recitation of the evening Shema extend? Until the end of the first watch. The term used in the Torah (Deuteronomy 6:7) to indicate the time for the recitation of the evening Shema is beshokhbekha, when you lie down, which refers to the time in which individuals go to sleep. Therefore, the time for the recitation of Shema is the first portion of the night, when individuals typically prepare for sleep. That is the statement of Rabbi Eliezer.
The Rabbis say: The time for the recitation of the evening Shema is until midnight. Rabban Gamliel says: One may recite Shema until dawn, indicating that beshokhbekha is to be understood as a reference to the entire time people sleep in their beds, the whole night. The mishna relates that Rabban Gamliel practiced in accordance with his ruling. There was an incident where Rabban Gamliel’s sons returned very late from a wedding hall. They said to him, as they had been preoccupied with celebrating with the groom and bride: We did not recite Shema. He said to them: If the dawn has not yet arrived, you are obligated to recite Shema. Since Rabban Gamliel’s opinion disagreed with that of the Rabbis, he explained to his sons that the Rabbis actually agree with him, and that it is not only with regard to the halakha of the recitation of Shema, but rather, wherever the Sages say until midnight, the mitzva may be performed until dawn. Rabban Gamliel cites several cases in support of his claim, such as the burning of fats and limbs on the altar. Due to the quantity of offerings each day, the priests were often unable to complete the burning of all of the fats and limbs, so they continued to be burned into the night, as it is written: “This is the law of the burnt offering: The burnt offering shall remain upon the pyre on the altar all night until morning, while the fire on the altar burns it” (Leviticus 6:2). And, with regard to all sacrifices, such as the sin-offerings and the guilt-offerings that are eaten for one day and night; although the Sages state that they may be eaten only until midnight, by Torah law they may be eaten until dawn. This is in accordance with the verse: “On the day on which it is offered must you eat. Do not leave it until the morning” (Leviticus 7:15). If so, why did the Sages say that they may be eaten only until midnight? This is in order to distance a person from transgression, as if one believes that he has until dawn to perform the mitzva, he might be negligent and postpone it until the opportunity to perform the mitzva has passed. GEMARA: The Mishna opens with the laws concerning the appropriate time to recite Shema with the question: From when does one recite Shema in the evening? With regard to this question, the Gemara asks: On the basis of what prior knowledge does the tanna of our mishna ask: From when? It would seem from his question that the obligation to recite Shema in the evening was already established, and that the tanna seeks only to clarify details that relate to it. But our mishna is the very first mishna in the Talmud. The Gemara asks: And furthermore, what distinguishes the evening Shema, that it was taught first? Let the tanna teach regarding the recitation of the morning Shema first. Since most mitzvot apply during the day, the tanna should discuss the morning Shema before discussing the evening Shema, just as the daily morning offering is discussed before the evening offering (Tosefot HaRosh). The Gemara offers a single response to both questions: The tanna bases himself on the verse as it is written: “You will talk of them when you sit in your home, and when you walk along the way, when you lie down, and when you arise” (Deuteronomy 6:7). By teaching the laws of the evening Shema first, the tanna has established that the teachings of the Oral Torah correspond to that which is taught in the Written Torah. And based on the Written Torah, the tanna teaches the oral law: When is the time for the recitation of Shema of lying down as commanded in the Torah? From when the priests enter to partake of their teruma. Just as the Written Torah begins with the evening Shema, so too must the Oral Torah. However, there is another possible explanation for why the mishna opens with the evening Shema rather than with the morning Shema. If you wish, you could say instead that the tanna derives the precedence of the evening Shema from the order of the creation of the world. As it is written in the story of creation: “And there was evening, and there was morning, one day” (Genesis 1:5). According to this verse, day begins with the evening and not the morning. For both of these reasons it was appropriate to open the discussion of the laws of the recitation of Shema with the evening Shema. The Gemara asks: If so, why does the latter clause of the mishna, which appears later in the chapter, teach: In the morning one recites two blessings before Shema and one blessing afterward, and in the evening one recites two blessings before Shema and two afterward? Based upon the above reasoning, the mishna should have taught the blessing recited before and after the evening Shema first. The Gemara answers: Indeed, the tanna began by discussing the laws regarding the recitation of the evening Shema, and then taught the laws regarding the recitation of the morning Shema. Once he was already dealing with the morning Shema, he explained the matters of the morning Shema, and then explained the matters of the evening Shema. The Gemara proceeds to clarify the rest of the mishna. The Master said in the mishna that the beginning of the period when one recites Shema in the evening is when the priests enter to partake of their teruma. However, this does not specify a definitive time. When do the priests enter to partake of their teruma? From the time of the emergence of the stars. If that is the case, then let the tanna teach that the time for the recitation of the evening Shema is from the time of the emergence of the stars. The Gemara responds: Indeed it would have been simpler to say that the time for the recitation of the evening Shema begins with the emergence of the stars, but the particular expression used by the tanna teaches us another matter in passing: When do priests partake of their teruma? From the time of the emergence of the stars. And the tanna teaches us a new halakha parenthetically: failure to bring an atonement offering does not prevent a priest from eating teruma. In cases where an impure priest is required to immerse himself in a ritual bath and bring an atonement offering, even if he already immersed himself, he is not completely ritually pure until he brings the atonement offering. Nevertheless, he is still permitted to partake of teruma. Taught in passing in our mishna, this is articulated fully in a baraita, based on a close reading of the biblical passages. As it was taught in a baraita with regard to the laws of ritual impurity, it is said: “One who touches it remains impure until evening. He should not eat of the consecrated items and he must wash his flesh with water. And the sun sets and it is purified. Afterwards, he may eat from the teruma, for it is his bread” (Leviticus 22:6–7). From the passage: “And the sun sets and it is purified,” that the absence of the setting of his sun prevents him from partaking of teruma, but failure to bring the atonement offering does not prevent him from partaking of teruma, may be inferred. The Gemara discusses the proof offered in the baraita: From where do we know that the phrase: “And the sun sets” refers to the complete setting of the sun, and therefore, “and it is purified” refers to the fact that the day is pure, i.e., and the sun sets and it is purified is one phrase meaning that the sun will set, the air will clear, and the stars will emerge (Rav Hai Gaon)? Perhaps the expression: “And the sun sets and it is purified” refers to the very beginning of sunset, the setting of the sun’s light. According to that explanation, what does the expression and it is purified mean? It means that the person will become purified. After immersing, he will wait until the beginning of sunset, and only then will he be able to eat of his teruma (Tosafot). Rabba bar Rav Sheila said: If so, that: And it is purified, means that the priest goes and purifies himself, then let the verse say unambiguously: And he will become purified. Since the Torah does not employ that language, the conclusion is: What is the meaning of the expression: And it is purified? It means the day is pure, no residue of day remains, as people say colloquially: The sun has set and the day is purified. In the West, Eretz Yisrael, they did not hear this explanation given by Rabba bar Rav Sheila. They raised the dilemma: Does the expression: And the sun sets, refer to the actual setting of the sun, and does: And it is purified, mean the day clears away? Or perhaps it refers to the setting of its light at sunset, in which case what is the meaning of: And it is purified? It refers to the purification of the person. In other words, in Eretz Yisrael, they attempted to clarify the halakha based on the biblical passage, but were unable to do so. Ultimately they resolved this dilemma from a baraita. It was taught in a baraita that the time for the recitation of the evening Shema corresponds to the time when priests are permitted to eat of their teruma, a sign for which is the emergence of the stars. Therefore, derive from here that “and the sun sets” refers to the complete sunset, and the expression “and it is purified” means the day clears away, as the Sages in Babylonia concluded. In our mishna, the Master said: The beginning of the time for the recitation of the evening Shema is: From the time when the priests enter to partake of their teruma. The Gemara raises a contradiction to this opinion from a baraita that states that the time for the recitation of the evening Shema is: From when a poor person enters to eat his bread with salt until he rises from his meal. The Gemara begins its analysis by clarifying whether there is an actual contradiction here, or whether different expressions are being employed to describe the same time. The latter clause of the baraita, which established that the time for the recitation of the evening Shema ends when a poor person rises from his meal, certainly disagrees with our mishna. Since the poor person clearly does not continue eating until the end of the first watch, this baraita certainly contradicts our mishna. With regard to the first clause of the baraita, however, which establishes the beginning of the time for the recitation of the evening Shema, shall we say that it disagrees with our mishna? The Gemara immediately rejects this idea: No, the time when the poor person eats and the time when the priest is purified and permitted to partake of his teruma are one and the same time. The Gemara raises a contradiction from the Tosefta: From when does one begin to recite Shema in the evening? From the time when people enter to eat their bread on Shabbat eve. This is the statement of Rabbi Meir. As they do in our mishna, the Rabbis say: From the time when the priests are eligible to partake of their teruma, a sign for which is the emergence of the stars. And although there is no explicit proof that the emergence of the stars is when one may begin to recite the evening Shema, there is an allusion in the book of Nehemiah to the fact that the emergence of the stars is generally considered the beginning of the night. As it is stated with regard to the building of the walls of Jerusalem: “And we perform the work, and half of them grasp their spears from dawn until the emergence of the stars” (Nehemiah 4:15). And it says: “That in the night they may be a guard to us, and may labor in the day” (Nehemiah 4:16). From here we ascertain that the day ends with the emergence of the stars. Even before analyzing these sources, the Gemara seeks to clarify a confusing element in the Tosefta. In their biblical proof, the Rabbis do not suffice with one verse, but rather they say: And it says…and they cite an additional verse. What is added by this use of: And it says? It seems superfluous, as the entire proof appears in the first verse. The Gemara answers that the first verse was not sufficient. As, if you say that night begins when the sun sets, but the workers stayed late and arrived early; i.e., due to the importance of their task they worked even into the night. In anticipation of this objection, the second verse was cited to teach: Come and hear, as it is stated: “That in the night they may be a guard to us, and may labor in the day,” the time between dawn and the emergence of the stars is explicitly referred to as “day,” proving that night begins with the emergence of the stars. In analyzing the three opinions regarding the beginning of the period for the recitation of the evening Shema, the Gemara begins with the supposition: It might enter your mind to say that the time when the poor person typically eats his meal and the time when ordinary people eat their Shabbat evening meal are one and the same time, since in both cases those eating would seek to begin their meals as early as possible, as, for different reasons, they are unable to kindle additional lights to illuminate their meal. And, if you say that the time of the poor person’s meal and the time when the priest is purified and permitted to partake of his teruma are one and the same time, then the opinion of the Rabbis is identical to that of Rabbi Meir. What is their disagreement? Rather, what we said previously must be rejected, and instead learn from this that there is a separate time for the poor person and a separate time for the priest. However, this conclusion is based on the assumption that the time of the poor person and the time of people are the same. That too can be rejected with the assertion that, no, the time of the poor person and the priest are one and the same time, and the time of the poor person and people are not the same. Accordingly, the opinion expressed by the tanna in our baraita is identical to that of the other tanna’im, and only Rabbi Meir disagrees with them. And is the time of the poor person and the priest the same? The Gemara raises a contradiction to this approach from another baraita, in which other opinions regarding the time for the recitation of the evening Shema are cited: From when does one begin to recite the evening Shema?
From the time when the day becomes sanctified on the eve of Shabbat, this is the statement of Rabbi Eliezer, who established an earlier time for Shema.
Rabbi Yehoshua, like our mishna, says: From the time when the priests are eligible to partake of their teruma.
Rabbi Meir says: The time for the recitation of Shema begins before the priests were purified, from when the priests immerse themselves in order to partake of their teruma.
Rabbi Yehuda said to Rabbi Meir: How is it possible that the time for the recitation of the evening Shema corresponds to the time of the priests’ immersion? Do the priests not immerse themselves during the day, so that with nightfall and the onset of a new day they will be purified? If so, how can that time be called night?
Rabbi Ḥanina says that the time for the recitation of the evening Shema begins when the poor person enters to eat his bread with salt.
But Rabbi Aḥai, and some say Rabbi Aḥa, says: From the time when most people enter to recline at their meal during the week.
The preceding was the text of the baraita. Returning to our question, if you say that the time of the poor person and the priest are one and the same time, then the opinion of Rabbi Ḥanina is identical to that of Rabbi Yehoshua. However, the fact that they are cited together indicates that they are not, in fact, the same. Rather, must one not conclude from this the time for the poor person is separate and the time for the priest is separate? Since no objection is raised, the Gemara concedes: Indeed, conclude from this. Having established that the time of the poor person and that of the priest are different, the Gemara seeks to determine: which one is later? The Gemara suggests that it is reasonable to conclude that the time of the poor person is later. As if you say that the poor person is earlier, it would be impossible to establish a time earlier than that established by Rabbi Yehoshua, unless we hold that night begins with sunset, in which case the opinion of Rabbi Ḥanina is identical to that of Rabbi Eliezer. Rather, must one not conclude from this that the poor person is later? The Gemara notes: Indeed, conclude from this. We learned that the Master said in a baraita that the time for the recitation of the evening Shema according to Rabbi Meir begins with the time of the immersion of the priests. Regarding this, Rabbi Yehuda said to Rabbi Meir: Do the priests not immerse themselves during the day? The Gemara notes: What Rabbi Yehuda said to Rabbi Meir seems correct, and how can Rabbi Meir respond? Rabbi Meir’s response is connected to the fundamental dispute over when night begins. After sunset, a period begins which is neither day nor night. The tanna’im disagree over the precise duration of this period known as twilight [bein hashemashot]. Rabbi Yehuda holds that twilight extends a full hour after sunset. Rabbi Neḥemya agrees in principle, though he disagrees over the specifics. Rabbi Yosei maintains that twilight is very brief, and occurs immediately before the emergence of the stars, which marks the beginning of the night. Regarding Rabbi Meir’s argument, Rabbi Yehuda asks that since the priests immerse themselves before twilight, they have a long wait until nightfall; clearly their immersion takes place while it is still day. The Gemara answers that Rabbi Meir said to Rabbi Yehuda as follows: Do you maintain that I am speaking of your definition of twilight? I am speaking of Rabbi Yosei’s definition of twilight, as Rabbi Yosei said: Twilight is like the blink of an eye; night begins and day ends and the time between them is so brief, it is impossible to quantify. According to this opinion, the priests immerse themselves just before the emergence of the stars, when it is already considered night.

אָמַר מָר מִשָּׁעָה שֶׁהַכֹּהֲנִים נִכְנָסִים לֶאֱכוֹל בִּתְרוּמָתָן. מִכְּדִי כֹּהֲנִים אֵימַת קָא אָכְלִי תְּרוּמָה, מִשְּׁעַת צֵאת הַכּוֹכָבִים, לִתְנֵי: ״מִשְּׁעַת צֵאת הַכּוֹכָבִים״. מִלְּתָא אַגַּב אוֹרְחֵיהּ קָמַשְׁמַע לַן, כֹּהֲנִים אֵימַת קָא אָכְלִי בִּתְרוּמָה, מִשְּׁעַת צֵאת הַכּוֹכָבִים.

The beginning of tractate Berakhot, the first tractate in the first of the six orders of Mishna, opens with a discussion of the recitation of Shema, as the recitation of Shema encompasses an acceptance of the yoke of Heaven and of the mitzvot, and as such, forms the basis for all subsequent teachings. The Mishna opens with the laws regarding the appropriate time to recite Shema:

MISHNA: From when, that is, from what time, does one recite Shema in the evening? From the time when the priests enter to partake of their teruma. Until when does the time for the recitation of the evening Shema extend? Until the end of the first watch. The term used in the Torah (Deuteronomy 6:7) to indicate the time for the recitation of the evening Shema is beshokhbekha, when you lie down, which refers to the time in which individuals go to sleep. Therefore, the time for the recitation of Shema is the first portion of the night, when individuals typically prepare for sleep. That is the statement of Rabbi Eliezer.
The Rabbis say: The time for the recitation of the evening Shema is until midnight. Rabban Gamliel says: One may recite Shema until dawn, indicating that beshokhbekha is to be understood as a reference to the entire time people sleep in their beds, the whole night. The mishna relates that Rabban Gamliel practiced in accordance with his ruling. There was an incident where Rabban Gamliel’s sons returned very late from a wedding hall. They said to him, as they had been preoccupied with celebrating with the groom and bride: We did not recite Shema. He said to them: If the dawn has not yet arrived, you are obligated to recite Shema. Since Rabban Gamliel’s opinion disagreed with that of the Rabbis, he explained to his sons that the Rabbis actually agree with him, and that it is not only with regard to the halakha of the recitation of Shema, but rather, wherever the Sages say until midnight, the mitzva may be performed until dawn. Rabban Gamliel cites several cases in support of his claim, such as the burning of fats and limbs on the altar. Due to the quantity of offerings each day, the priests were often unable to complete the burning of all of the fats and limbs, so they continued to be burned into the night, as it is written: “This is the law of the burnt offering: The burnt offering shall remain upon the pyre on the altar all night until morning, while the fire on the altar burns it” (Leviticus 6:2). And, with regard to all sacrifices, such as the sin-offerings and the guilt-offerings that are eaten for one day and night; although the Sages state that they may be eaten only until midnight, by Torah law they may be eaten until dawn. This is in accordance with the verse: “On the day on which it is offered must you eat. Do not leave it until the morning” (Leviticus 7:15). If so, why did the Sages say that they may be eaten only until midnight? This is in order to distance a person from transgression, as if one believes that he has until dawn to perform the mitzva, he might be negligent and postpone it until the opportunity to perform the mitzva has passed. GEMARA: The Mishna opens with the laws concerning the appropriate time to recite Shema with the question: From when does one recite Shema in the evening? With regard to this question, the Gemara asks: On the basis of what prior knowledge does the tanna of our mishna ask: From when? It would seem from his question that the obligation to recite Shema in the evening was already established, and that the tanna seeks only to clarify details that relate to it. But our mishna is the very first mishna in the Talmud. The Gemara asks: And furthermore, what distinguishes the evening Shema, that it was taught first? Let the tanna teach regarding the recitation of the morning Shema first. Since most mitzvot apply during the day, the tanna should discuss the morning Shema before discussing the evening Shema, just as the daily morning offering is discussed before the evening offering (Tosefot HaRosh). The Gemara offers a single response to both questions: The tanna bases himself on the verse as it is written: “You will talk of them when you sit in your home, and when you walk along the way, when you lie down, and when you arise” (Deuteronomy 6:7). By teaching the laws of the evening Shema first, the tanna has established that the teachings of the Oral Torah correspond to that which is taught in the Written Torah. And based on the Written Torah, the tanna teaches the oral law: When is the time for the recitation of Shema of lying down as commanded in the Torah? From when the priests enter to partake of their teruma. Just as the Written Torah begins with the evening Shema, so too must the Oral Torah. However, there is another possible explanation for why the mishna opens with the evening Shema rather than with the morning Shema. If you wish, you could say instead that the tanna derives the precedence of the evening Shema from the order of the creation of the world. As it is written in the story of creation: “And there was evening, and there was morning, one day” (Genesis 1:5). According to this verse, day begins with the evening and not the morning. For both of these reasons it was appropriate to open the discussion of the laws of the recitation of Shema with the evening Shema. The Gemara asks: If so, why does the latter clause of the mishna, which appears later in the chapter, teach: In the morning one recites two blessings before Shema and one blessing afterward, and in the evening one recites two blessings before Shema and two afterward? Based upon the above reasoning, the mishna should have taught the blessing recited before and after the evening Shema first. The Gemara answers: Indeed, the tanna began by discussing the laws regarding the recitation of the evening Shema, and then taught the laws regarding the recitation of the morning Shema. Once he was already dealing with the morning Shema, he explained the matters of the morning Shema, and then explained the matters of the evening Shema. The Gemara proceeds to clarify the rest of the mishna. The Master said in the mishna that the beginning of the period when one recites Shema in the evening is when the priests enter to partake of their teruma. However, this does not specify a definitive time. When do the priests enter to partake of their teruma? From the time of the emergence of the stars. If that is the case, then let the tanna teach that the time for the recitation of the evening Shema is from the time of the emergence of the stars. The Gemara responds: Indeed it would have been simpler to say that the time for the recitation of the evening Shema begins with the emergence of the stars, but the particular expression used by the tanna teaches us another matter in passing: When do priests partake of their teruma? From the time of the emergence of the stars. And the tanna teaches us a new halakha parenthetically: failure to bring an atonement offering does not prevent a priest from eating teruma. In cases where an impure priest is required to immerse himself in a ritual bath and bring an atonement offering, even if he already immersed himself, he is not completely ritually pure until he brings the atonement offering. Nevertheless, he is still permitted to partake of teruma. Taught in passing in our mishna, this is articulated fully in a baraita, based on a close reading of the biblical passages. As it was taught in a baraita with regard to the laws of ritual impurity, it is said: “One who touches it remains impure until evening. He should not eat of the consecrated items and he must wash his flesh with water. And the sun sets and it is purified. Afterwards, he may eat from the teruma, for it is his bread” (Leviticus 22:6–7). From the passage: “And the sun sets and it is purified,” that the absence of the setting of his sun prevents him from partaking of teruma, but failure to bring the atonement offering does not prevent him from partaking of teruma, may be inferred. The Gemara discusses the proof offered in the baraita: From where do we know that the phrase: “And the sun sets” refers to the complete setting of the sun, and therefore, “and it is purified” refers to the fact that the day is pure, i.e., and the sun sets and it is purified is one phrase meaning that the sun will set, the air will clear, and the stars will emerge (Rav Hai Gaon)? Perhaps the expression: “And the sun sets and it is purified” refers to the very beginning of sunset, the setting of the sun’s light. According to that explanation, what does the expression and it is purified mean? It means that the person will become purified. After immersing, he will wait until the beginning of sunset, and only then will he be able to eat of his teruma (Tosafot). Rabba bar Rav Sheila said: If so, that: And it is purified, means that the priest goes and purifies himself, then let the verse say unambiguously: And he will become purified. Since the Torah does not employ that language, the conclusion is: What is the meaning of the expression: And it is purified? It means the day is pure, no residue of day remains, as people say colloquially: The sun has set and the day is purified. In the West, Eretz Yisrael, they did not hear this explanation given by Rabba bar Rav Sheila. They raised the dilemma: Does the expression: And the sun sets, refer to the actual setting of the sun, and does: And it is purified, mean the day clears away? Or perhaps it refers to the setting of its light at sunset, in which case what is the meaning of: And it is purified? It refers to the purification of the person. In other words, in Eretz Yisrael, they attempted to clarify the halakha based on the biblical passage, but were unable to do so. Ultimately they resolved this dilemma from a baraita. It was taught in a baraita that the time for the recitation of the evening Shema corresponds to the time when priests are permitted to eat of their teruma, a sign for which is the emergence of the stars. Therefore, derive from here that “and the sun sets” refers to the complete sunset, and the expression “and it is purified” means the day clears away, as the Sages in Babylonia concluded. In our mishna, the Master said: The beginning of the time for the recitation of the evening Shema is: From the time when the priests enter to partake of their teruma. The Gemara raises a contradiction to this opinion from a baraita that states that the time for the recitation of the evening Shema is: From when a poor person enters to eat his bread with salt until he rises from his meal. The Gemara begins its analysis by clarifying whether there is an actual contradiction here, or whether different expressions are being employed to describe the same time. The latter clause of the baraita, which established that the time for the recitation of the evening Shema ends when a poor person rises from his meal, certainly disagrees with our mishna. Since the poor person clearly does not continue eating until the end of the first watch, this baraita certainly contradicts our mishna. With regard to the first clause of the baraita, however, which establishes the beginning of the time for the recitation of the evening Shema, shall we say that it disagrees with our mishna? The Gemara immediately rejects this idea: No, the time when the poor person eats and the time when the priest is purified and permitted to partake of his teruma are one and the same time. The Gemara raises a contradiction from the Tosefta: From when does one begin to recite Shema in the evening? From the time when people enter to eat their bread on Shabbat eve. This is the statement of Rabbi Meir. As they do in our mishna, the Rabbis say: From the time when the priests are eligible to partake of their teruma, a sign for which is the emergence of the stars. And although there is no explicit proof that the emergence of the stars is when one may begin to recite the evening Shema, there is an allusion in the book of Nehemiah to the fact that the emergence of the stars is generally considered the beginning of the night. As it is stated with regard to the building of the walls of Jerusalem: “And we perform the work, and half of them grasp their spears from dawn until the emergence of the stars” (Nehemiah 4:15). And it says: “That in the night they may be a guard to us, and may labor in the day” (Nehemiah 4:16). From here we ascertain that the day ends with the emergence of the stars. Even before analyzing these sources, the Gemara seeks to clarify a confusing element in the Tosefta. In their biblical proof, the Rabbis do not suffice with one verse, but rather they say: And it says…and they cite an additional verse. What is added by this use of: And it says? It seems superfluous, as the entire proof appears in the first verse. The Gemara answers that the first verse was not sufficient. As, if you say that night begins when the sun sets, but the workers stayed late and arrived early; i.e., due to the importance of their task they worked even into the night. In anticipation of this objection, the second verse was cited to teach: Come and hear, as it is stated: “That in the night they may be a guard to us, and may labor in the day,” the time between dawn and the emergence of the stars is explicitly referred to as “day,” proving that night begins with the emergence of the stars. In analyzing the three opinions regarding the beginning of the period for the recitation of the evening Shema, the Gemara begins with the supposition: It might enter your mind to say that the time when the poor person typically eats his meal and the time when ordinary people eat their Shabbat evening meal are one and the same time, since in both cases those eating would seek to begin their meals as early as possible, as, for different reasons, they are unable to kindle additional lights to illuminate their meal. And, if you say that the time of the poor person’s meal and the time when the priest is purified and permitted to partake of his teruma are one and the same time, then the opinion of the Rabbis is identical to that of Rabbi Meir. What is their disagreement? Rather, what we said previously must be rejected, and instead learn from this that there is a separate time for the poor person and a separate time for the priest. However, this conclusion is based on the assumption that the time of the poor person and the time of people are the same. That too can be rejected with the assertion that, no, the time of the poor person and the priest are one and the same time, and the time of the poor person and people are not the same. Accordingly, the opinion expressed by the tanna in our baraita is identical to that of the other tanna’im, and only Rabbi Meir disagrees with them. And is the time of the poor person and the priest the same? The Gemara raises a contradiction to this approach from another baraita, in which other opinions regarding the time for the recitation of the evening Shema are cited: From when does one begin to recite the evening Shema?
From the time when the day becomes sanctified on the eve of Shabbat, this is the statement of Rabbi Eliezer, who established an earlier time for Shema.
Rabbi Yehoshua, like our mishna, says: From the time when the priests are eligible to partake of their teruma.
Rabbi Meir says: The time for the recitation of Shema begins before the priests were purified, from when the priests immerse themselves in order to partake of their teruma.
Rabbi Yehuda said to Rabbi Meir: How is it possible that the time for the recitation of the evening Shema corresponds to the time of the priests’ immersion? Do the priests not immerse themselves during the day, so that with nightfall and the onset of a new day they will be purified? If so, how can that time be called night?
Rabbi Ḥanina says that the time for the recitation of the evening Shema begins when the poor person enters to eat his bread with salt.
But Rabbi Aḥai, and some say Rabbi Aḥa, says: From the time when most people enter to recline at their meal during the week.
The preceding was the text of the baraita. Returning to our question, if you say that the time of the poor person and the priest are one and the same time, then the opinion of Rabbi Ḥanina is identical to that of Rabbi Yehoshua. However, the fact that they are cited together indicates that they are not, in fact, the same. Rather, must one not conclude from this the time for the poor person is separate and the time for the priest is separate? Since no objection is raised, the Gemara concedes: Indeed, conclude from this. Having established that the time of the poor person and that of the priest are different, the Gemara seeks to determine: which one is later? The Gemara suggests that it is reasonable to conclude that the time of the poor person is later. As if you say that the poor person is earlier, it would be impossible to establish a time earlier than that established by Rabbi Yehoshua, unless we hold that night begins with sunset, in which case the opinion of Rabbi Ḥanina is identical to that of Rabbi Eliezer. Rather, must one not conclude from this that the poor person is later? The Gemara notes: Indeed, conclude from this. We learned that the Master said in a baraita that the time for the recitation of the evening Shema according to Rabbi Meir begins with the time of the immersion of the priests. Regarding this, Rabbi Yehuda said to Rabbi Meir: Do the priests not immerse themselves during the day? The Gemara notes: What Rabbi Yehuda said to Rabbi Meir seems correct, and how can Rabbi Meir respond? Rabbi Meir’s response is connected to the fundamental dispute over when night begins. After sunset, a period begins which is neither day nor night. The tanna’im disagree over the precise duration of this period known as twilight [bein hashemashot]. Rabbi Yehuda holds that twilight extends a full hour after sunset. Rabbi Neḥemya agrees in principle, though he disagrees over the specifics. Rabbi Yosei maintains that twilight is very brief, and occurs immediately before the emergence of the stars, which marks the beginning of the night. Regarding Rabbi Meir’s argument, Rabbi Yehuda asks that since the priests immerse themselves before twilight, they have a long wait until nightfall; clearly their immersion takes place while it is still day. The Gemara answers that Rabbi Meir said to Rabbi Yehuda as follows: Do you maintain that I am speaking of your definition of twilight? I am speaking of Rabbi Yosei’s definition of twilight, as Rabbi Yosei said: Twilight is like the blink of an eye; night begins and day ends and the time between them is so brief, it is impossible to quantify. According to this opinion, the priests immerse themselves just before the emergence of the stars, when it is already considered night.

וּרְמִינְהוּ: מֵאֵימָתַי קוֹרִין אֶת שְׁמַע בָּעֲרָבִין, מִשֶּׁהֶעָנִי נִכְנָס לֶאֱכוֹל פִּתּוֹ בְּמֶלַח, עַד שָׁעָה שֶׁעוֹמֵד לִיפָּטֵר מִתּוֹךְ סְעוּדָּתוֹ. סֵיפָא, וַדַּאי פְּלִיגָא אַמַּתְנִיתִין. רֵישָׁא, מִי לֵימָא פְּלִיגִי אַמַּתְנִיתִין. לָא, עָנִי וְכֹהֵן חַד שִׁיעוּרָא הוּא.

וּרְמִינְהוּ: מֵאֵימָתַי מַתְחִילִין לִקְרוֹת קְרִיאַת שְׁמַע בְּעַרְבִית, מִשָּׁעָה שֶׁבְּנֵי אָדָם נִכְנָסִין לֶאֱכוֹל פִּתָּן בְּעַרְבֵי שַׁבָּתוֹת, דִּבְרֵי רַבִּי מֵאִיר. וַחֲכָמִים אוֹמְרִים: מִשָּׁעָה שֶׁהַכֹּהֲנִים זַכָּאִין לֶאֱכוֹל בִּתְרוּמָתָן ... קָא סָלְקָא דַּעְתָּךְ דְּעָנִי וּבְנֵי אָדָם חַד שִׁעוּרָא הוּא. וְאִי אָמְרַתְּ עָנִי וְכֹהֵן חַד שִׁעוּרָא הוּא, חֲכָמִים הַיְינוּ רַבִּי מֵאִיר. אֶלָּא, שְׁמַע מִינַּהּ עָנִי שִׁעוּרָא לְחוּד וְכֹהֵן שִׁעוּרָא לְחוּד.

לָא, עָנִי וְכֹהֵן חַד שִׁעוּרָא הוּא, וְעָנִי וּבְנֵי אָדָם לָאו חַד שִׁעוּרָא הוּא.

וְעָנִי וְכֹהֵן חַד שִׁעוּרָא הוּא, וּרְמִינְהוּ: מֵאֵימָתַי מַתְחִילִין לִקְרוֹת שְׁמַע בָּעֲרָבִין, מִשָּׁעָה שֶׁקָּדַשׁ הַיּוֹם בְּעַרְבֵי שַׁבָּתוֹת, דִּבְרֵי רַבִּי אֱלִיעֶזֶר. רַבִּי יְהוֹשֻׁעַ אוֹמֵר: מִשָּׁעָה שֶׁהַכֹּהֲנִים מְטוֹהָרִים לֶאֱכוֹל בִּתְרוּמָתָן. רַבִּי מֵאִיר אוֹמֵר, מִשָּׁעָה שֶׁהַכֹּהֲנִים טוֹבְלִין לֶאֱכוֹל בִּתְרוּמָתָן. אָמַר לוֹ רַבִּי יְהוּדָה: וַהֲלֹא כֹּהֲנִים מִבְּעוֹד יוֹם הֵם טוֹבְלִים. רַבִּי חֲנִינָא אוֹמֵר מִשָּׁעָה שֶׁעָנִי נִכְנָס לֶאֱכוֹל פִּתּוֹ בְּמֶלַח. רַבִּי אַחַאי וְאָמְרִי לַהּ רַבִּי אַחָא אוֹמֵר: מִשָּׁעָה שֶׁרוֹב בְּנֵי אָדָם נִכְנָסִין לְהָסֵב. וְאִי אָמְרַתְּ עָנִי וְכֹהֵן חַד שִׁעוּרָא הוּא, רַבִּי חֲנִינָא הַיְינוּ רַבִּי יְהוֹשֻׁעַ! אֶלָּא לָאו שְׁמַע מִינַּהּ שִׁעוּרָא דְּעָנִי לְחוּד וְשִׁעוּרָא דְּכֹהֵן לְחוּד, שְׁמַע מִינַּהּ.

הֵי מִינַּיְיהוּ מְאוּחָר? מִסְתַּבְּרָא דְּעָנִי מְאוּחָר דְּאִי אָמְרַתְּ דְּעָנִי מוּקְדָּם רַבִּי חֲנִינָא הַיְינוּ רַבִּי אֱלִיעֶזֶר. אֶלָּא לָאו שְׁמַע מִינַּהּ דְּעָנִי מְאוּחָר. שְׁמַע מִינַּהּ.

אָמַר מָר. אֲמַר לֵיהּ רַבִּי יְהוּדָה: וַהֲלֹא כֹּהֲנִים מִבְּעוֹד יוֹם הֵם טוֹבְלִים! שַׁפִּיר קָאָמַר לֵיהּ רַבִּי יְהוּדָה לְרַבִּי מֵאִיר? וְרַבִּי מֵאִיר הָכִי קָאָמַר לֵיהּ: מִי סָבְרַתְּ דַּאֲנָא אַבֵּין הַשְּׁמָשׁוֹת דִּידָךְ קָא אָמֵינָא, אֲנָא אַבֵּין הַשְּׁמָשׁוֹת דְּרַבִּי יוֹסֵי קָא אָמֵינָא, דְּאָמַר רַבִּי יוֹסֵי בֵּין הַשְּׁמָשׁוֹת כְּהֶרֶף עַיִן, זֶה נִכְנָס, וְזֶה יוֹצֵא, וְאִי אֶפְשָׁר לַעֲמוֹד עָלָיו.

Perhaps the expression: “And the sun sets and it is purified” refers to the very beginning of sunset, the setting of the sun’s light. According to that explanation, what does the expression and it is purified mean? It means that the person will become purified. After immersing, he will wait until the beginning of sunset, and only then will he be able to eat of his teruma (Tosafot). Rabba bar Rav Sheila said: If so, that: And it is purified, means that the priest goes and purifies himself, then let the verse say unambiguously: And he will become purified. Since the Torah does not employ that language, the conclusion is: What is the meaning of the expression: And it is purified? It means the day is pure, no residue of day remains, as people say colloquially: The sun has set and the day is purified. In the West, Eretz Yisrael, they did not hear this explanation given by Rabba bar Rav Sheila. They raised the dilemma: Does the expression: And the sun sets, refer to the actual setting of the sun, and does: And it is purified, mean the day clears away? Or perhaps it refers to the setting of its light at sunset, in which case what is the meaning of: And it is purified? It refers to the purification of the person. In other words, in Eretz Yisrael, they attempted to clarify the halakha based on the biblical passage, but were unable to do so. Ultimately they resolved this dilemma from a baraita. It was taught in a baraita that the time for the recitation of the evening Shema corresponds to the time when priests are permitted to eat of their teruma, a sign for which is the emergence of the stars. Therefore, derive from here that “and the sun sets” refers to the complete sunset, and the expression “and it is purified” means the day clears away, as the Sages in Babylonia concluded. In our mishna, the Master said: The beginning of the time for the recitation of the evening Shema is: From the time when the priests enter to partake of their teruma. The Gemara raises a contradiction to this opinion from a baraita that states that the time for the recitation of the evening Shema is: From when a poor person enters to eat his bread with salt until he rises from his meal. The Gemara begins its analysis by clarifying whether there is an actual contradiction here, or whether different expressions are being employed to describe the same time. The latter clause of the baraita, which established that the time for the recitation of the evening Shema ends when a poor person rises from his meal, certainly disagrees with our mishna. Since the poor person clearly does not continue eating until the end of the first watch, this baraita certainly contradicts our mishna. With regard to the first clause of the baraita, however, which establishes the beginning of the time for the recitation of the evening Shema, shall we say that it disagrees with our mishna? The Gemara immediately rejects this idea: No, the time when the poor person eats and the time when the priest is purified and permitted to partake of his teruma are one and the same time. The Gemara raises a contradiction from the Tosefta: From when does one begin to recite Shema in the evening? From the time when people enter to eat their bread on Shabbat eve. This is the statement of Rabbi Meir. As they do in our mishna, the Rabbis say: From the time when the priests are eligible to partake of their teruma, a sign for which is the emergence of the stars. And although there is no explicit proof that the emergence of the stars is when one may begin to recite the evening Shema, there is an allusion in the book of Nehemiah to the fact that the emergence of the stars is generally considered the beginning of the night. As it is stated with regard to the building of the walls of Jerusalem: “And we perform the work, and half of them grasp their spears from dawn until the emergence of the stars” (Nehemiah 4:15). And it says: “That in the night they may be a guard to us, and may labor in the day” (Nehemiah 4:16). From here we ascertain that the day ends with the emergence of the stars. Even before analyzing these sources, the Gemara seeks to clarify a confusing element in the Tosefta. In their biblical proof, the Rabbis do not suffice with one verse, but rather they say: And it says…and they cite an additional verse. What is added by this use of: And it says? It seems superfluous, as the entire proof appears in the first verse. The Gemara answers that the first verse was not sufficient. As, if you say that night begins when the sun sets, but the workers stayed late and arrived early; i.e., due to the importance of their task they worked even into the night. In anticipation of this objection, the second verse was cited to teach: Come and hear, as it is stated: “That in the night they may be a guard to us, and may labor in the day,” the time between dawn and the emergence of the stars is explicitly referred to as “day,” proving that night begins with the emergence of the stars. In analyzing the three opinions regarding the beginning of the period for the recitation of the evening Shema, the Gemara begins with the supposition: It might enter your mind to say that the time when the poor person typically eats his meal and the time when ordinary people eat their Shabbat evening meal are one and the same time, since in both cases those eating would seek to begin their meals as early as possible, as, for different reasons, they are unable to kindle additional lights to illuminate their meal. And, if you say that the time of the poor person’s meal and the time when the priest is purified and permitted to partake of his teruma are one and the same time, then the opinion of the Rabbis is identical to that of Rabbi Meir. What is their disagreement? Rather, what we said previously must be rejected, and instead learn from this that there is a separate time for the poor person and a separate time for the priest. However, this conclusion is based on the assumption that the time of the poor person and the time of people are the same. That too can be rejected with the assertion that, no, the time of the poor person and the priest are one and the same time, and the time of the poor person and people are not the same. Accordingly, the opinion expressed by the tanna in our baraita is identical to that of the other tanna’im, and only Rabbi Meir disagrees with them. And is the time of the poor person and the priest the same? The Gemara raises a contradiction to this approach from another baraita, in which other opinions regarding the time for the recitation of the evening Shema are cited: From when does one begin to recite the evening Shema?
From the time when the day becomes sanctified on the eve of Shabbat, this is the statement of Rabbi Eliezer, who established an earlier time for Shema.
Rabbi Yehoshua, like our mishna, says: From the time when the priests are eligible to partake of their teruma.
Rabbi Meir says: The time for the recitation of Shema begins before the priests were purified, from when the priests immerse themselves in order to partake of their teruma.
Rabbi Yehuda said to Rabbi Meir: How is it possible that the time for the recitation of the evening Shema corresponds to the time of the priests’ immersion? Do the priests not immerse themselves during the day, so that with nightfall and the onset of a new day they will be purified? If so, how can that time be called night?
Rabbi Ḥanina says that the time for the recitation of the evening Shema begins when the poor person enters to eat his bread with salt.
But Rabbi Aḥai, and some say Rabbi Aḥa, says: From the time when most people enter to recline at their meal during the week.
The preceding was the text of the baraita. Returning to our question, if you say that the time of the poor person and the priest are one and the same time, then the opinion of Rabbi Ḥanina is identical to that of Rabbi Yehoshua. However, the fact that they are cited together indicates that they are not, in fact, the same. Rather, must one not conclude from this the time for the poor person is separate and the time for the priest is separate? Since no objection is raised, the Gemara concedes: Indeed, conclude from this. Having established that the time of the poor person and that of the priest are different, the Gemara seeks to determine: which one is later? The Gemara suggests that it is reasonable to conclude that the time of the poor person is later. As if you say that the poor person is earlier, it would be impossible to establish a time earlier than that established by Rabbi Yehoshua, unless we hold that night begins with sunset, in which case the opinion of Rabbi Ḥanina is identical to that of Rabbi Eliezer. Rather, must one not conclude from this that the poor person is later? The Gemara notes: Indeed, conclude from this. We learned that the Master said in a baraita that the time for the recitation of the evening Shema according to Rabbi Meir begins with the time of the immersion of the priests. Regarding this, Rabbi Yehuda said to Rabbi Meir: Do the priests not immerse themselves during the day? The Gemara notes: What Rabbi Yehuda said to Rabbi Meir seems correct, and how can Rabbi Meir respond? Rabbi Meir’s response is connected to the fundamental dispute over when night begins. After sunset, a period begins which is neither day nor night. The tanna’im disagree over the precise duration of this period known as twilight [bein hashemashot]. Rabbi Yehuda holds that twilight extends a full hour after sunset. Rabbi Neḥemya agrees in principle, though he disagrees over the specifics. Rabbi Yosei maintains that twilight is very brief, and occurs immediately before the emergence of the stars, which marks the beginning of the night. Regarding Rabbi Meir’s argument, Rabbi Yehuda asks that since the priests immerse themselves before twilight, they have a long wait until nightfall; clearly their immersion takes place while it is still day. The Gemara answers that Rabbi Meir said to Rabbi Yehuda as follows: Do you maintain that I am speaking of your definition of twilight? I am speaking of Rabbi Yosei’s definition of twilight, as Rabbi Yosei said: Twilight is like the blink of an eye; night begins and day ends and the time between them is so brief, it is impossible to quantify. According to this opinion, the priests immerse themselves just before the emergence of the stars, when it is already considered night.

(דף ב.) מאימתי קורין את שמע בערבין משעה שהכהנים נכנסין לאכול בתרומתן עד סוף האשמורה הראשונה דברי ר' אליעזר וחכמים אומרים עד חצות רבן גמליאל אומר עד שיעלה עמוד השחר: גמ' (דף ב:) תנו רבנן מאימתי מתחילין לקרות קריאת שמע בערבין משעה שבני אדם נכנסין לאכול פתן בערבי שבתות דברי ר"מ וחכמים אומרים משעה שהכהנים זכאין לאכול בתרומתן סימן לדבר צאת הכוכבים ואע"פ שאין ראיה לדבר זכר לדבר שנאמר (נחמיה ד׳:ט״ו) ואנחנו עושים במלאכה וחצים מחזיקין ברמחים מעלות השחר עד צאת הכוכבים ואומר (נחמיה ד׳:ט״ז) והיו לנו הלילה משמר והיום מלאכה.

שמעינן השתא דבין למתניתין ובין לברייתא עונת ק"ש לרבנן משעה שהכהנים נכנסין לאכול בתרומתן דהיא שעת צאת הכוכבים והכין הלכתא דקיימא לן יחיד ורבים הלכה כרבים והאי דאקשינן דר' אליעזר אדר' אליעזר דתניא מאימתי מתחילין לקרות ק"ש בערבין משעה שקדש היום בערבי שבתות דברי רבי אליעזר ותנן נמי במתניתין משעה שהכהנים נכנסין לאכול בתרומתן דברי ר"א לאו למימרא דהאי דקתני במתניתין משעה שהכהנים נכנסין לאכול בתרומתן לר' אליעזר בלחוד היא אלא בין רבי אליעזר בין רבנן הכי סבירא להו דהא לא אפליגו רבנן עליה דרבי אליעזר אלא בעד סוף דרבי אליעזר סבר עד סוף האשמורה הראשונה ורבנן סברי עד חצות אבל במשעה שהכהנים נכנסין לאכול בתרומתן לא פליגי דאי לא סבירא להו לרבנן משעה שהכהנים נכנסין לאכול בתרומתן אלא ר"א בלחוד הוא דסבירא ליה הכי הוה להו לרבנן לאיפלוגי עליה במשעה כדאפליגו עליה בעד סוף ומדלא אפליגו עליה אלא בעד סוף שמעינן דבין לר"א ובין לרבנן כולהו סבירא להו משעה שהכהנים נכנסין לאכול בתרומתן וכיון דס"ל לר"א בהדי רבנן משעה שהכהנים נכנסין לאכול בתרומתן ואשכחינן ליה בברייתא דס"ל משעה שקדש היום בערבי שבתות אקשינן (דף ג.) דידיה אדידיה ופרקינן תרי תנאי אליבא דר"א ולהאיך פירוקא בתרא דאמרינן איבעית אימא סיפא רבי אליעזר רישא לאו ר"א ברירא מילתא דמשעה שהכהנים נכנסין לאכול בתרומתן לרבנן בלחוד היא ולאו רבי אליעזר הלכך בין לפרוקא קמא בין לפרוקא בתרא האי דקתני במתניתין משעה שהכהנים נכנסין לאכול בתרומתן איתא לרבנן וכיון דאיתא לרבנן עבדינן כוותייהו.

(ט) אֵיזֶה הוּא זְמַן קְרִיאַת שְׁמַע בַּלַּיְלָה. מִצְוָתָהּ מִשְּׁעַת יְצִיאַת הַכּוֹכָבִים עַד חֲצִי הַלַּיְלָה. וְאִם עָבַר וְאִחֵר וְקָרָא עַד שֶׁלֹּא עָלָה עַמּוּד הַשַּׁחַר יָצָא יְדֵי חוֹבָתוֹ שֶׁלֹּא אָמְרוּ עַד חֲצוֹת אֶלָּא כְּדֵי לְהַרְחִיק אָדָם מִן הַפְּשִׁיעָה:

(1) We [are obligated to] recite the Shema twice daily - in the evening and in the morning - as [Deuteronomy 6:7] states: "...when you lie down and when you rise" - i.e., when people are accustomed to sleep - this being the night - and when people are accustomed to rise, this being daytime.

(2) And what is it that one recites? These three sections:
"Hear O Israel..." (Deuteronomy 6:4-9),

"And if you will listen..." (Deuteronomy 11:13-21),and

"And God said..." (Numbers 15:37-41).
We begin with the section of "Hear O Israel" since it contains [the concept of] the unity of God, [the commandment of] loving Him and the study of Torah, it being a fundamental principle upon which everything is based.
After it, [we read] "And if you will listen...," since it contains the imperative to fulfill the rest of the commandments, and finally the portion of tzitzit, since it also contains the imperative of remembering all the commandments.

(3) The commandment of tzitzit is not obligatory at night. Nevertheless, we recite [the section describing] it at night because it contains mention of the exodus from Egypt.
We are commanded to mention the exodus both during the day and at night as [Deuteronomy 16:3] states: "In order that you shall remember the day of your leaving the land of Egypt all the days of your life."
Reading these three sections in this order constitutes the recitation of the Shema.

(4) When reciting the Shema, after completing the first verse, one says quietly "Blessed be the name of the glory of His Kingdom forever." He then continues to read the first section in its normal fashion: "And you shall love God, your Lord..."
Why do we read it in this fashion? It is our tradition that when the patriarch, Jacob, gathered all his sons together in Egypt close to his death, he commanded and urged them regarding the Unity of God and the path of God upon which Abraham and Isaac, his father, had tread.
He asked them: "My sons, perhaps there are dregs among you, one who does not stand with me in the Unity of God?" This is comparable to the manner in which Moses, our teacher, said to us: "Lest there be among you a man or woman [whose heart turns this day from God...]" (Deuteronomy 29:17).
They all answered and said: "Listen, Israel, God is our Lord, God is One," i.e., listen to us, Israel, our father, God is our Lord, God is One.
The wise elder responded: "Blessed be the Name of the Glory of His Kingdom forever." Therefore, the Jews are accustomed to utter the praise that Israel, the wise elder, uttered after this verse.

(5) Blessings are recited before and after Kri'at Shema. In the day, one recites two blessings before it and one after it. At night, one recites two blessings before and two blessings after it.

(6) The first blessing preceding [the Shema] in the day [begins: "Blessed are You, God...], the One who forms the light and creates darkness,..." The second blessing [begins with]: "With everlasting love, You have loved us..."
[The Shema] is followed by [the section beginning] "True and certain..."
The first blessing preceding [the Shema] at night [begins: "Blessed are You, God...], the One who brings the evening,..." and the second [begins] "With everlasting love, You have loved Your people Israel." The first blessing after [the Shema] is [the section begining] "True and faithful..." and the second [begins] "Lay us down..."

(7) The first blessing preceding [the Shema], both in the day and at night, begins "Blessed [are You, God, our Lord...]" and concludes "Blessed [are You, God]..." The rest of the blessings all conclude with "Blessed [are]...," but do not begin "Blessed [are]..."
These blessings and all the rest of the blessings familiar to the Jewish people were instituted by Ezra, the scribe, and his court. One may not detract from them or add to them.
In every instance that they decreed to conclude with "Blessed...," one may not omit this conclusion. Where they decreed not to conclude [with "Blessed..."], one may not conclude with it. Where they decreed not to begin with "Blessed," one may not begin with it. Where they decreed to begin [with "Blessed..."], one may not omit it.
The general principle is that anyone who deviates from the set form of blessings established by the Sages is mistaken and must recite the blessing again in its proper form.
Anyone who does not say [the paragraph of] "True and certain..." in the morning prayer or [the paragraph of] "True and faithful..." in the evening prayer does not fulfill his obligation.

(8) One who recites the second blessing before the first, whether in the day or at night, or whether the transposed blessings are recited before or after Kri'at Shema, fulfills his obligation, since there is no absolute order to the blessings.
A person who begins with "...the One who forms the light..." and concludes with "...the One who brings the evenings" in the morning prayer does not fulfill his obligation.
Were he to begin with "...the One who brings the evenings" and conclude with "...the One who forms the light", he would fulfill his obligation. Were he to begin with "...the One who brings the evenings" ...and conclude with "...the One who forms the light" in the evening, he would not fulfill his obligtation.
If he begins with "...the One who forms light" and concludes with "...the One who brings the evenings" - he fulfills his obligation since all blessings are defined by their conclusions.

(9) When is the [proper] time for the recitation of Shema at night? The commandment [starts] from the time of the appearance of the stars [and continues] until midnight.
A person who transgresses and delays fulfills his obligation if he recites [the Shema] before dawn. [The Sages established the limit] of midnight only in order to distance us from negligent wrongdoing.

(10) One who reads the Shema [of the night] after dawn, [but] before sunrise, does not fulfill his obligation unless he was unavoidably detained - e.g., drunk or sick, or in a similar situation. A person who was so detained and reads [the Shema] at this time does not recite [the blessing of] "Lay us down."

(11) When is the proper time [for the recitation of the Shema] during the day? The commandment is that one should start to read before sunrise in order to conclude and recite the last blessing with the sunrise. This measure [of time] is one-tenth of an hour before the sun rises.
A person who delays and reads the Shema after the sun rises fulfills his obligation, for the proper time is until the end of the third hour of the day for one who transgresses and delays.

(12) One who is overhasty and recites the Shema of the morning prayers after dawn, even though he finishes before sunrise, fulfills his obligation. In extraordinary circumstances - e.g., one who rises early in order to travel - one may recite it at the outset from dawn.

(13) One who recited [the Shema] after [the end of] the third hour, even if he was unavoidably detained, does not fulfill his obligation to recite the Shema at its proper time. He can be compared to one who studies Torah.
He should recite the blessings preceding it and after it all day, even if he delays and recited it after [the end of] the third hour.

מאימתי קורין שמע בערבין משעת יציאת הכוכבים.

ומאימתי זמן ק"ש של ערבית, כדתנן, בשעה שהכהנים נכנסים לאכול בתרומתן והיינו צאת הכוכבים כ"כ רב אלפס וכ"כ רב פלטוי הקורא ק"ש קודם שראה שלשה כוכבים אם נתכוין לכך לא יצא י"ח ויחזור ויקרא ויתפלל ואם לא נתכוון לכך וטעה והתפלל אל יחזור ויתפלל וכ"כ רב עמרם ואפילו קראה תוך בה"ש שהוא ספק יום ספק לילה איתא בירושלמי שחוזר וקורא אותה וכן פירש"י שזמנה מיציאת הכוכבים.

זמן קריאת שמע בלילה משעת יציאת שלשה ככבים קטנים ואם הוא יום מעונן ימתין עד שיצא הספק מלבו ואם קראה קודם לכן חוזר וקורא אותה בלא ברכות ואם הצבור מקדימים לקרות ק"ש מבעוד יום יקרא עמהם ק"ש וברכותיה ויתפלל עמהם וכשמגיע זמן קורא ק"ש בלא ברכות.

מסקנה: תחילת קריאת זמן של ערבית, שנוי במחלוקת תנאים. אך להלכה מוסכם בפי כל הפוסקים, כדעת המשנה, חכמים בברייתא ורבי יהושע בברייתא נוספת, שהזמן הוא משעת 'צאת הכוכבים'.

הגדרתו של זמן 'צאת הכוכבים' הינו נושא בפני עצמו