Talmud Tuesdays - Session 118+

(א) פַּעֲמַיִם בְּכָל יוֹם קוֹרְאִין קְרִיאַת שְׁמַע, בָּעֶרֶב וּבַבֹּקֶר. שֶׁנֶּאֱמַר (דברים ו ז) ״וּבְשָׁכְבְּךָ וּבְקוּמֶךָ״ בְּשָׁעָה שֶׁדֶּרֶךְ בְּנֵי אָדָם שׁוֹכְבִין וְזֶה הוּא לַיְלָה. וּבְשָׁעָה שֶׁדֶּרֶךְ בְּנֵי אָדָם עוֹמְדִין וְזֶה הוּא יוֹם:

(ב) וּמַה הוּא קוֹרֵא, שְׁלֹשָׁה פָּרָשִׁיּוֹת. אֵלּוּ הֵן (דברים ו ד) ״שְׁמַע״ (דברים יא יג) ״וְהָיָה אִם שָׁמֹעַ״ (במדבר טו לז) ״וַיֹּאמֶר״. וּמַקְדִּימִין לִקְרוֹת פָּרָשַׁת שְׁמַע מִפְּנֵי שֶׁיֵּשׁ בָּהּ יִחוּד הַשֵּׁם וְאַהֲבָתוֹ וְתַלְמוּדוֹ שֶׁהוּא הָעִקָּר הַגָּדוֹל שֶׁהַכּל תָּלוּי בּוֹ. וְאַחֲרֶיהָ וְהָיָה אִם שָׁמֹעַ שֶׁיֵּשׁ בָּהּ צִוּוּי עַל (זְכִירַת) שְׁאָר כָּל הַמִּצְוֹת. וְאַחַר כָּךְ פָּרָשַׁת (במדבר טו לח) ״צִיצִית״ שֶׁגַּם הִיא יֵשׁ בָּהּ צִוּוּי זְכִירַת כָּל הַמִּצְוֹת:

(ג) אַף עַל פִּי שֶׁאֵין מִצְוַת צִיצִית נוֹהֶגֶת בַּלַּיְלָה קוֹרְאִין אוֹתָהּ בַּלַּיְלָה מִפְּנֵי שֶׁיֵּשׁ בָּהּ זִכְרוֹן יְצִיאַת מִצְרַיִם וּמִצְוָה לְהַזְכִּיר יְצִיאַת מִצְרַיִם בַּיּוֹם וּבַלַּיְלָה שֶׁנֶּאֱמַר (דברים טז ג) ״לְמַעַן תִּזְכֹּר אֶת יוֹם צֵאתְךָ מֵאֶרֶץ מִצְרַיִם כּל יְמֵי חַיֶּיךָ״. וּקְרִיאַת שָׁלֹשׁ פָּרָשִׁיּוֹת אֵלּוּ עַל סֵדֶר זֶה הִיא הַנִּקְרֵאת קְרִיאַת שְׁמַע:

(ד) הַקּוֹרֵא קְרִיאַת שְׁמַע כְּשֶׁהוּא גּוֹמֵר פָּסוּק רִאשׁוֹן אוֹמֵר בְּלַחַשׁ בָּרוּךְ שֵׁם כְּבוֹד מַלְכוּתוֹ לְעוֹלָם וָעֶד וְחוֹזֵר וְקוֹרֵא כְּדַרְכּוֹ (דברים ו ה) ״וְאָהַבְתָּ אֵת יְיָ׳‎ אֱלֹהֶיךָ״ עַד סוֹפָהּ. וְלָמָּה קוֹרִין כֵּן. מָסֹרֶת הִיא בְּיָדֵינוּ שֶׁבְּשָׁעָה שֶׁקִּבֵּץ יַעֲקֹב אָבִינוּ אֶת בָּנָיו בְּמִצְרַיִם בִּשְׁעַת מִיתָתוֹ צִוָּם וְזֵרְזָם עַל יִחוּד הַשֵּׁם וְעַל דֶּרֶךְ ה׳‎ שֶׁהָלַךְ בָּהּ אַבְרָהָם וְיִצְחָק אָבִיו וְשָׁאַל אוֹתָם וְאָמַר לָהֶם בָּנַי שֶׁמָּא יֵשׁ בָּכֶם פַּסְלוּת מִי שֶׁאֵינוֹ עוֹמֵד עִמִּי בְּיִחוּד הַשֵּׁם כָּעִנְיָן שֶׁאָמַר לָנוּ משֶׁה רַבֵּנוּ (דברים כט יז) ״פֶּן יֵשׁ בָּכֶם אִישׁ אוֹ אִשָּׁה״ וְגוֹ׳‎. עָנוּ כֻּלָּם וְאָמְרוּ (דברים ו ד) ״שְׁמַע יִשְׂרָאֵל יְיָ׳‎ אֱלֹהֵינוּ יְיָ׳‎ אֶחָד״. כְּלוֹמַר שְׁמַע מִמֶּנּוּ אָבִינוּ יִשְׂרָאֵל יְיָ׳‎ אֱלֹהֵינוּ יְיָ׳‎ אֶחָד. פָּתַח הַזָּקֵן וְאָמַר בָּרוּךְ שֵׁם כְּבוֹד מַלְכוּתוֹ לְעוֹלָם וָעֶד. לְפִיכָךְ נָהֲגוּ כָּל יִשְׂרָאֵל לוֹמַר שֶׁבַח שֶׁשִּׁבֵּחַ בּוֹ יִשְׂרָאֵל הַזָּקֵן אַחַר פָּסוּק זֶה:

(ה) הַקּוֹרֵא קְרִיאַת שְׁמַע מְבָרֵךְ לְפָנֶיהָ וּלְאַחֲרֶיהָ. בַּיּוֹם מְבָרֵךְ שְׁתַּיִם לְפָנֶיהָ וְאַחַת לְאַחֲרֶיהָ. וּבַלַּיְלָה מְבָרֵךְ שְׁתַּיִם לְפָנֶיהָ וּשְׁתַּיִם לְאַחֲרֶיהָ:

(ו) בְּרָכָה רִאשׁוֹנָה שֶׁלְּפָנֶיהָ בַּיּוֹם יוֹצֵר אוֹר וּבוֹרֵא חשֶׁךְ וְכוּ׳‎ וּבְרָכָה שְׁנִיָּה אַהֲבַת עוֹלָם אֲהַבְתָּנוּ. וְשֶׁל אַחֲרֶיהָ אֱמֶת וְיַצִּיב. וּבְרָכָה רִאשׁוֹנָה שֶׁלְּפָנֶיהָ בַּלַּיְלָה מַעֲרִיב עֲרָבִים וְכוּ׳‎ שְׁנִיָּה לָהּ אַהֲבַת עוֹלָם בֵּית יִשְׂרָאֵל עַמְּךָ אָהַבְתָּ כוּ׳‎. וּבְרָכָה רִאשׁוֹנָה שֶׁל אַחֲרֶיהָ אֱמֶת וֶאֱמוּנָה. שְׁנִיָּה לָהּ הַשְׁכִּיבֵנוּ:

(ז) בְּרָכָה רִאשׁוֹנָה שֶׁלְּפָנֶיהָ בֵּין בַּיּוֹם בֵּין בַּלַּיְלָה פּוֹתֵחַ בָּהּ בְּבָרוּךְ וְחוֹתֵם בָּהּ בְּבָרוּךְ. וּשְׁאָר בִּרְכוֹתֶיהָ חוֹתֵם בְּכָל אַחַת מֵהֶן בְּבָרוּךְ וְאֵין לָהֶם פְּתִיחָה בְּבָרוּךְ. בְּרָכוֹת אֵלּוּ עִם שְׁאָר כָּל הַבְּרָכוֹת הָעֲרוּכוֹת בְּפִי כָּל יִשְׂרָאֵל עֶזְרָא הַסּוֹפֵר וּבֵית דִּינוֹ תִּקְּנוּם וְאֵין אָדָם רַשַּׁאי לִפְחֹת מֵהֶם וְלֹא לְהוֹסִיף עֲלֵיהֶם. מָקוֹם שֶׁהִתְקִינוּ לַחְתֹּם בְּבָרוּךְ אֵינוֹ רַשַּׁאי שֶׁלֹּא לַחְתֹּם. וּמָקוֹם שֶׁהִתְקִינוּ שֶׁלֹּא לַחְתֹּם אֵינוֹ רַשַּׁאי לַחְתֹּם. מָקוֹם שֶׁהִתְקִינוּ שֶׁלֹּא לִפְתֹּחַ בְּבָרוּךְ אֵינוֹ רַשַּׁאי לִפְתֹּחַ. מָקוֹם שֶׁהִתְקִינוּ לִפְתֹּחַ אֵינוֹ רַשַּׁאי שֶׁלֹּא לִפְתֹּחַ. כְּלָלוֹ שֶׁל דָּבָר כָּל הַמְשַׁנֶּה מִמַּטְבֵּעַ שֶׁטָּבְעוּ חֲכָמִים בַּבְּרָכוֹת הֲרֵי זֶה טוֹעֶה וְחוֹזֵר וּמְבָרֵךְ כַּמַּטְבֵּעַ. וְכָל שֶׁאֵינוֹ אוֹמֵר אֱמֶת וְיַצִּיב בְּשַׁחֲרִית וֶאֱמֶת וֶאֱמוּנָה בְּעַרְבִית לֹא יָצָא יְדֵי חוֹבָתוֹ:

(ח) הִקְדִּים בְּרָכָה שְׁנִיָּה לִבְרָכָה רִאשׁוֹנָה בֵּין בַּיּוֹם בֵּין בַּלַּיְלָה בֵּין לְפָנֶיהָ בֵּין לְאַחֲרֶיהָ יָצָא לְפִי שֶׁאֵין סֵדֶר בַּבְּרָכוֹת. בְּשַׁחֲרִית פָּתַח יוֹצֵר אוֹר וְסִיֵּם מַעֲרִיב עֲרָבִים לֹא יָצָא. פָּתַח בְּמַעֲרִיב עֲרָבִים וְסִיֵּם בְּיוֹצֵר אוֹר יָצָא. וּבָעֶרֶב פָּתַח בְּמַעֲרִיב עֲרָבִים וְסִיֵּם בְּיוֹצֵר אוֹר לֹא יָצָא. פָּתַח בְּיוֹצֵר אוֹר וְסִיֵּם בְּמַעֲרִיב עֲרָבִים יָצָא. שֶׁכָּל הַבְּרָכוֹת הוֹלְכוֹת אַחַר חֲתִימָתָן:

(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:

(י) הַקּוֹרֵא קְרִיאַת שְׁמַע שֶׁל עַרְבִית אַחַר שֶׁיַּעֲלֶה עַמּוּד הַשַּׁחַר קֹדֶם הָנֵץ הַחַמָּה לֹא יָצָא יְדֵי חוֹבָתוֹ אֶלָּא אִם כֵּן הָיָה אָנוּס כְּגוֹן שִׁכּוֹר אוֹ חוֹלֶה וְכַיּוֹצֵא בָּהֶן. וְאָנוּס שֶׁקָּרָא בְּעֵת זֶה אֵינוֹ אוֹמֵר הַשְׁכִּיבֵנוּ:

(יא) וְאֵי זֶה הוּא זְמַנָּה בַּיּוֹם. מִצְוָתָהּ שֶׁיַּתְחִיל לִקְרוֹת קֹדֶם הָנֵץ הַחַמָּה כְּדֵי שֶׁיִּגְמֹר לִקְרוֹת וּלְבָרֵךְ בְּרָכָה אַחֲרוֹנָה עִם הָנֵץ הַחַמָּה. וְשִׁעוּר זֶה כְּמוֹ [עִשּׂוּר] שָׁעָה קֹדֶם שֶׁתַּעֲלֶה הַשֶּׁמֶשׁ. וְאִם אִחֵר וְקָרָא קְרִיאַת שְׁמַע אַחַר שֶׁתַּעֲלֶה הַשֶּׁמֶשׁ יָצָא יְדֵי חוֹבָתוֹ שֶׁעוֹנָתָהּ עַד סוֹף שָׁלֹשׁ שָׁעוֹת בַּיּוֹם לְמִי שֶׁעָבַר וְאִחֵר:

(יב) מִי שֶׁהִקְדִּים וְקָרָא קְרִיאַת שְׁמַע שֶׁל שַׁחֲרִית אַחַר שֶׁיַּעֲלֶה עַמּוּד הַשַּׁחַר אַף עַל פִּי שֶׁהִשְׁלִים קֹדֶם שֶׁתָּנֵץ הַחַמָּה יָצָא יְדֵי חוֹבָתוֹ. וּבִשְׁעַת הַדְּחָק כְּגוֹן שֶׁהָיָה מַשְׁכִּים לָצֵאת לַדֶּרֶךְ קוֹרֵא לְכַתְּחִלָּה מִשֶּׁעָלָה עַמּוּד הַשַּׁחַר:

(יג) הַקּוֹרֵא אַחַר שָׁלֹשׁ שָׁעוֹת בַּיּוֹם אֲפִלּוּ הָיָה אָנוּס לֹא יָצָא יְדֵי חוֹבַת קְרִיאַת שְׁמַע בְּעוֹנָתוֹ. אֶלָּא הֲרֵי הוּא כְּקוֹרֵא בַּתּוֹרָה. וּמְבָרֵךְ לְפָנֶיהָ וּלְאַחֲרֶיהָ כָּל הַיּוֹם אֲפִלּוּ אִחֵר וְקָרָא אַחַר שָׁלֹשׁ שָׁעוֹת:

(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.

מֵאֵימָתַי קוֹרִין אֶת שְׁמַע בָּעֲרָבִין? מִשָּׁעָה שֶׁהַכֹּהֲנִים נִכְנָסִים לֶאֱכוֹל בִּתְרוּמָתָן. עַד סוֹף הָאַשְׁמוּרָה הָרִאשׁוֹנָה. דִּבְרֵי רַבִּי אֱלִיעֶזֶר. וַחֲכָמִים אוֹמְרִים: עַד חֲצוֹת. רַבָּן גַּמְלִיאֵל אוֹמֵר עַד שֶׁיַּעֲלֶה עַמּוּד הַשַּׁחַר. מַעֲשֶׂה וּבָאוּ בָנָיו מִבֵּית הַמִּשְׁתֶּה, אָמְרוּ לוֹ: לֹא קָרִינוּ אֶת שְׁמַע, אָמַר לָהֶם: אִם לֹא עָלָה עַמּוּד הַשַּׁחַר חַיָּיבִין אַתֶּם לִקְרוֹת. וְלֹא זוֹ בִּלְבַד אָמְרוּ, אֶלָּא כָּל מַה שֶּׁאָמְרוּ חֲכָמִים ״עַד חֲצוֹת״, מִצְוָתָן עַד שֶׁיַּעֲלֶה עַמּוּד הַשַּׁחַר. הֶקְטֵר חֲלָבִים וְאֵבָרִים, מִצְוָתָן עַד שֶׁיַּעֲלֶה עַמּוּד הַשַּׁחַר וְכָל הַנֶּאֱכָלִים לְיוֹם אֶחָד, מִצְוָתָן עַד שֶׁיַּעֲלֶה עַמּוּד הַשַּׁחַר. אִם כֵּן, לָמָה אָמְרוּ חֲכָמִים ״עַד חֲצוֹת״ — כְּדֵי לְהַרְחִיק אָדָם מִן הָעֲבֵירָה: גְּמָ׳ תַּנָּא הֵיכָא קָאֵי דְּקָתָנֵי ״מֵאֵימָתַי״? וְתוּ: מַאי שְׁנָא דְּתָנֵי בְּעַרְבִית בְּרֵישָׁא? לִתְנֵי דְּשַׁחֲרִית בְּרֵישָׁא! תַּנָּא אַקְּרָא קָאֵי, דִּכְתִיב: ״בְּשָׁכְבְּךָ וּבְקוּמֶךָ״. וְהָכִי קָתָנֵי: זְמַן קְרִיאַת שְׁמַע דִּשְׁכִיבָה אֵימַת? — מִשָּׁעָה שֶׁהַכֹּהֲנִים נִכְנָסִין לֶאֱכוֹל בִּתְרוּמָתָן. וְאִי בָּעֵית אֵימָא: יָלֵיף מִבְּרִיָּיתוֹ שֶׁל עוֹלָם, דִּכְתִיב: ״וַיְהִי עֶרֶב וַיְהִי בֹקֶר יוֹם אֶחָד״. אִי הָכִי, סֵיפָא דְּקָתָנֵי ״בַּשַּׁחַר מְבָרֵךְ שְׁתַּיִם לְפָנֶיהָ וְאַחַת לְאַחֲרֶיהָ, בָּעֶרֶב מְבָרֵךְ שְׁתַּיִם לְפָנֶיהָ וּשְׁתַּיִם לְאַחֲרֶיהָ״, לִתְנֵי דְּעַרְבִית בְּרֵישָׁא! תַּנָּא פָּתַח בְּעַרְבִית, וַהֲדַר תָּנֵי בְּשַׁחֲרִית, עַד דְּקָאֵי בְּשַׁחֲרִית, פָּרֵישׁ מִילֵּי דְשַׁחֲרִית, וַהֲדַר פָּרֵישׁ מִילֵּי דְעַרְבִית. 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. וְהָא קָמַשְׁמַע לַן דְּכַפָּרָה לָא מְעַכְּבָא. כִּדְתַנְיָא: ״וּבָא הַשֶּׁמֶשׁ וְטָהֵר״ — בִּיאַת שִׁמְשׁוֹ מְעַכַּבְתּוֹ מִלֶּאֱכוֹל בִּתְרוּמָה, וְאֵין כַּפָּרָתוֹ מְעַכַּבְתּוֹ מִלֶּאֱכוֹל בִּתְרוּמָה. וּמִמַּאי דְּהַאי ״וּבָא הַשֶּׁמֶשׁ״ בִּיאַת הַשֶּׁמֶשׁ, וְהַאי ״וְטָהֵר״ — טְהַר יוֹמָא.
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)?