nedarim 32a

 תַּנְיָא רַבִּי אוֹמֵר: גְּדוֹלָה מִילָה, שֶׁאֵין לָךְ מִי שֶׁנִּתְעַסֵּק בְּמִצְוֹת כְּאַבְרָהָם אָבִינוּ, וְלֹא נִקְרָא תָּמִים אֶלָּא עַל שֵׁם מִילָה, שֶׁנֶּאֱמַר: ״הִתְהַלֵּךְ לְפָנַי וֶהְיֵה תָמִים״, וּכְתִיב: ״וְאֶתְּנָה בְרִיתִי בֵּינִי וּבֵינֶךָ״.

It is taught in a baraita: Rabbi Yehuda HaNasi says: Great is the mitzva of circumcision, for there is no one who was engaged in mitzvot like Abraham our Patriarch, and yet he was called wholehearted only due to the mitzva of circumcision, as it is stated: “Walk before Me and you should be wholehearted” (Genesis 17:1), and it is written in the next verse: “And I will make My covenant between Me and you” (Genesis 17:2), and Abraham was then commanded with regard to circumcision. This indicates that he was not called wholehearted until he performed circumcision.

דָּבָר אַחֵר: גְּדוֹלָה מִילָה, שֶׁשְּׁקוּלָה כְּנֶגֶד כׇּל הַמִּצְוֹת שֶׁבַּתּוֹרָה, שֶׁנֶּאֱמַר: ״כִּי עַל פִּי הַדְּבָרִים הָאֵלֶּה וְגוֹ׳״, דָּבָר אַחֵר: גְּדוֹלָה מִילָה, שֶׁאִילְמָלֵא מִילָה לֹא נִתְקַיְּימוּ שָׁמַיִם וָאָרֶץ, שֶׁנֶּאֱמַר: ״אִם לֹא בְּרִיתִי יוֹמָם וָלָיְלָה וְגוֹ׳״.

Alternatively, so great is the mitzva of circumcision that it is equal to all the mitzvot of the Torah, as it is stated at the giving of the Torah: “For according to these words I have made a covenant with you and with Israel” (Exodus 34:27), and “covenant” refers to circumcision. Alternatively, so great is the mitzva of circumcision that if not for circumcision heaven and earth would not have been established, as it is stated: “If My covenant be not with day and night, I would not have appointed the ordinances of heaven and earth” (Jeremiah 33:25), and the covenant that exists day and night is the covenant of circumcision, as it is always found on the person’s body.

וּפְלִיגָא דְּרַבִּי אֱלִיעֶזֶר, דְּאָמַר רַבִּי אֱלִיעֶזֶר: גְּדוֹלָה תּוֹרָה, שֶׁאִילְמָלֵא תּוֹרָה לֹא נִתְקַיְּימוּ שָׁמַיִם וָאָרֶץ, שֶׁנֶּאֱמַר: ״אִם לֹא בְרִיתִי יוֹמָם וָלָיְלָה חֻקּוֹת שָׁמַיִם וָאָרֶץ לֹא שָׂמְתִּי וְגוֹ׳״.

The Gemara comments: And this statement disagrees with the words of Rabbi Eliezer, for Rabbi Eliezer said: Great is the Torah, for if not for Torah, heaven and earth would not have been established, as it is stated: “If My covenant be not with day and night, I would not have appointed the ordinances of heaven and earth” (Jeremiah 33:25). According to Rabbi Eliezer, the covenant that exists day and night is the Torah, as it says: “You should contemplate it day and night” (Joshua 1:8).

אָמַר רַב יְהוּדָה אָמַר רַ