Berakhot 33a
ברכות ל״ג א
Berakhot 33a:11
The passage states that the request for rain is recited in the blessing of the years because rain is a component of sustenance, and it also records the locations of the references to rain and havdala in the Amida.
מַתְנִי׳ מַזְכִּירִין גְּבוּרוֹת גְּשָׁמִים בִּתְחִיַּית הַמֵּתִים, וּשְׁאֵלָה בְּבִרְכַּת הַשָּׁנִים, וְהַבְדָּלָה בְּחוֹנֵן הַדָּעַת. רַבִּי עֲקִיבָא אוֹמֵר: אוֹמְרָהּ בְּרָכָה רְבִיעִית בִּפְנֵי עַצְמָהּ. רַבִּי אֱלִיעֶזֶר אוֹמֵר: בַּהוֹדָאָה. וּשְׁאֵלָה בְּבִרְכַּת הַשָּׁנִים: מַאי טַעְמָא? אָמַר רַב יוֹסֵף: מִתּוֹךְ שֶׁהִיא פַּרְנָסָה, לְפִיכָךְ קְבָעוּהָ בְּבִרְכַּת פַּרְנָסָה.
MISHNA: This mishna speaks of additions to the standard formula of the Amida prayer and the blessings in which they are incorporated. One mentions the might of the rains and recites: He makes the wind blow and the rain fall, in the second blessing of the Amida prayer, the blessing of the revival of the dead. And the request for rain: And grant dew and rain as a blessing, in the ninth blessing of the Amida prayer, the blessing of the years. And the prayer of distinction [havdala], between the holy and the profane recited in the evening prayer following Shabbat and festivals, in the fourth blessing of the Amida prayer: Who graciously grants knowledge. Rabbi Akiva says: Havdala is recited as an independent fourth blessing. Rabbi Eliezer says that it is recited in the seventeenth blessing of the Amida prayer, the blessing of thanksgiving. And we also learned in the mishna that the request for rain is added to the blessing of the years. Here, too, the Gemara asks: What is the reason that the request for rain is recited specifically in that blessing? Rav Yosef said: Because rain is a component of sustenance, therefore it was inserted in the blessing of sustenance as part of our request for bountiful sustenance.

