The Gemara responds: Actually, Rabbi Eliezer holds that the night consists of three watches, and he employs this particular language of watches in order to teach us: There are watches in heaven and there are watches on earth; just as our night is divided into watches, so too is the night in the upper worlds. As it was taught in a baraita: Rabbi Eliezer says: The night consists of three watches, and over each and every watch, the Holy One, Blessed be He, sits and roars like a lion in pain over the destruction of the Temple. This imagery is derived from a reference in the Bible, as it is stated: “The Lord roars [yishag] from on high, from His holy dwelling He makes His voice heard. He roars mightily [shaog yishag] over His dwelling place, He cries out like those who tread grapes, against all the inhabitants of the earth” (Jeremiah 25:30). The three instances of the root shin-alef-gimmel in this verse correspond to the three watches of the night.
And signs of the transition between each of these watches in the upper world can be sensed in this world: In the first watch, the donkey brays; in the second, dogs bark; and in the third people begin to rise, a baby nurses from its mother’s breast and a wife converses with her husband.
למאי נפקא מינה למיקרי קריאת שמע למאן דגני בבית אפל ולא ידע זמן קריאת שמע אימת כיון דאשה מספרת עם בעלה ותינוק יונק משדי אמו ליקום וליקרי.
What is the practical ramification of this sign? It is relevant to one who recites Shema while lying in a dark house, who cannot see the dawn and who does not know when the time for reciting Shema arrives. That person is provided with a sign that when a woman speaks with her husband and a baby nurses from its mother’s breast, the final watch of the night has ended and he must rise and recite Shema.
(כא) הוּא הָיָה אוֹמֵר, בֶּן חָמֵשׁ שָׁנִים לַמִּקְרָא, בֶּן עֶשֶׂר לַמִּשְׁנָה, בֶּן שְׁלשׁ עֶשְׂרֵה לַמִּצְוֹת, בֶּן חֲמֵשׁ עֶשְׂרֵה לַתַּלְמוּד, בֶּן שְׁמֹנֶה עֶשְׂרֵה לַחֻפָּה, בֶּן עֶשְׂרִים לִרְדֹּף, בֶּן שְׁלשִׁים לַכֹּחַ, בֶּן אַרְבָּעִים לַבִּינָה, בֶּן חֲמִשִּׁים לָעֵצָה, בֶּן שִׁשִּׁים לַזִּקְנָה, בֶּן שִׁבְעִים לַשֵּׂיבָה, בֶּן שְׁמֹנִים לַגְּבוּרָה, בֶּן תִּשְׁעִים לָשׁוּחַ, בֶּן מֵאָה כְּאִלּוּ מֵת וְעָבַר וּבָטֵל מִן הָעוֹלָם:
(21) He [Yehudah ben Teima] used to say: Five years [is the age] for [the study of] Scripture, Ten [is the age] for [the study of] Mishnah, Thirteen [is the age] for [observing] commandments, Fifteen [is the age] for [the study of] Talmud, Eighteen [is the age] for the [wedding] canopy, Twenty [is the age] for pursuit, Thirty [is the age] for [full] strength, Forty [is the age] for understanding, Fifty [is the age] for [giving] counsel, Sixty [is the age] for mature age, Seventy [is the age] for a hoary head, Eighty [is the age] for [superadded] strength, Ninety [is the age] for [a] bending [stature], One hundred, is [the age at which one is] as if dead, passed away, and ceased from the world.
I should note that in the mishnaic period there was no concept of a “bar mitzvah.” That is to say, the idea that a child becomes obligated for all of the commandments at one particular age did not yet exist. Rather, it seems that a child was obligated for particular commandments when she/he was able to either physically or mentally perform that commandment. We can see this in this baraita. As soon as he knows how to put on a tallit, he must do so. As soon as he knows how to take care of his tefillin he must do so. This age is certainly younger than thirteen. The notion that 12/13 is the age of obligation is a talmudic innovation.
She said to him: You have no white hair, and it is inappropriate for one so young to head the Sages. The Gemara relates: That day, he was eighteen years old, a miracle transpired for him and eighteen rows of hair turned white. The Gemara comments: That explains that which Rabbi Elazar ben Azarya said: I am as one who is seventy years old and he did not say: I am seventy years old, because he looked older than he actually was.
מַעֲשֶׂה בְּרַבִּי אֱלִיעֶזֶר וְרַבִּי יְהוֹשֻׁעַ וְרַבִּי אֶלְעָזָר בֶּן־עֲזַרְיָה וְרַבִּי עֲקִיבָא וְרַבִּי טַרְפוֹן שֶׁהָיוּ מְסֻבִּין בִּבְנֵי־בְרַק וְהָיוּ מְסַפְּרִים בִּיצִיאַת מִצְרַיִם כָּל־אוֹתוֹ הַלַּיְלָה, עַד שֶׁבָּאוּ תַלְמִידֵיהֶם וְאָמְרוּ לָהֶם רַבּוֹתֵינוּ הִגִּיעַ זְמַן קְרִיאַת שְׁמַע שֶׁל שַׁחֲרִית.
It happened once [on Pesach] that Rabbi Eliezer, Rabbi Yehoshua, Rabbi Elazar ben Azariah, Rabbi Akiva and Rabbi Tarfon were reclining in Bnei Brak and were telling the story of the exodus from Egypt that whole night, until their students came and said to them, "The time of [reciting] the morning Shema has arrived."
אָמַר רַבִּי אֶלְעָזָר בֶּן־עֲזַרְיָה הֲרֵי אֲנִי כְּבֶן שִׁבְעִים שָׁנָה וְלֹא זָכִיתִי שֶׁתֵּאָמֵר יְצִיאַת מִצְרַיִם בַּלֵּילוֹת עַד שֶׁדְּרָשָׁהּ בֶּן זוֹמָא, שֶׁנֶּאֱמַר, לְמַעַן תִּזְכֹּר אֶת יוֹם צֵאתְךָ מֵאֶרֶץ מִצְרַיִם כֹּל יְמֵי חַיֶּיךָ. יְמֵי חַיֶּיךָ הַיָּמִים. כֹּל יְמֵי חַיֶּיךָ הַלֵּילוֹת. וַחֲכָמִים אוֹמְרִים יְמֵי חַיֶּיךָ הָעוֹלָם הַזֶּה. כֹּל יְמֵי חַיֶּיךָ לְהָבִיא לִימוֹת הַמָּשִׁיחַ:
Rabbi Elazar ben Azariah said, "Behold I am like a man of seventy years and I have not merited [to understand why] the exodus from Egypt should be said at night until Ben Zoma explicated it, as it is stated (Deuteronomy 16:3), 'In order that you remember the day of your going out from the land of Egypt all the days of your life;' 'the days of your life' [indicates that the remembrance be invoked during] the days, 'all the days of your life' [indicates that the remembrance be invoked also during] the nights." But the Sages say, "'the days of your life' [indicates that the remembrance be invoked in] this world, 'all the days of your life' [indicates that the remembrance be invoked also in] the next world."
(כב) בֶּן בַּג בַּג אוֹמֵר, הֲפֹךְ בָּהּ וַהֲפֹךְ בָּהּ, דְּכֹלָּא בָהּ. וּבָהּ תֶּחֱזֵי, וְסִיב וּבְלֵה בָהּ, וּמִנַּהּ לֹא תָזוּעַ, שֶׁאֵין לְךָ מִדָּה טוֹבָה הֵימֶנָּה:
(22) Ben Bag Bag says: Search in it and search in it, since everything is in it. And in it should you look, and grow old and be worn in it; and from it do not move, since there is no characteristic greater than it.