Mishnayos Nedarim Perek 3 Mishnah 11

If one says: The property of the descendants of Noah is konam for me, and for that reason I will not benefit from it, he is permitted to derive benefit from a Jew but prohibited from deriving benefit from the nations of the world. If one says: The property of the offspring of Abraham is forbidden to me, and for that reason I will not benefit from it, he is prohibited from deriving benefit from a Jew but permitted to derive benefit from the nations of the world. If one says: The property of a Jew is forbidden to me, and for that reason I will not benefit from it, he may purchase items from a Jew for more than the market price and may sell items to a Jew for less than the market price, so that he does not derive benefit from the transactions. If one says: Benefit from me is forbidden to a Jew, he may purchase items from a Jew for less than the market price and may sell items to a Jew for more than the market price, so that he does not derive benefit from the transactions. But although this would be permitted, they do not listen to him, i.e., people will generally not agree to deal with him in a manner that causes them a loss in every transaction. If one says: The property of a Jew is forbidden to me, and for that reason I will not benefit from them, and my property is forbidden to a Jew and they will not benefit from me, in this case he may benefit from the nations of the world but not from a Jew, and a Jew may not benefit from him. If one says: Benefiting from those who are uncircumcised is konam for me, he is permitted to derive benefit from uncircumcised Jews because they are not regarded as uncircumcised, but he is prohibited from deriving benefit from the circumcised of the nations of the world. Conversely, if he said: Benefiting from those who are circumcised is konam for me, he is prohibited from deriving benefit even from uncircumcised Jews and he is permitted to derive benefit from the circumcised of the nations of the world, as the term uncircumcised is used only to name the nations of the world, as it is stated: “For all the nations are uncircumcised, but all the house of Israel are uncircumcised in the heart” (Jeremiah 9:25), and it says: “And this uncircumcised Philistine shall be” (I Samuel 17:36), and it says: “Lest the daughters of the Philistines rejoice, lest the daughters of the uncircumcised triumph” (II Samuel 1:20). These verses indicate that ordinary gentiles are referred to as uncircumcised, regardless of whether they are actually circumcised. Rabbi Elazar ben Azarya says: The foreskin is repulsive, as is evident from the fact that the wicked are disgraced through it, as it is stated: “Behold, the days come, says the Lord, that I will punish all them that are circumcised in their uncircumcision: Egypt, and Judah, and Edom, and the children of Ammon, and Moab, and all that have the corners of their hair polled, that dwell in the wilderness; for all the nations are uncircumcised, but all the house of Israel are uncircumcised in the heart” (Jeremiah 9:25), which indicates that there is an element of disgrace associated with the foreskin. Rabbi Yishmael says: So great is the mitzva of circumcision that thirteen covenants were sealed with regard to it, for the word covenant appears thirteen times in the biblical passage that discusses circumcision (Genesis, chapter 17). Rabbi Yosei says: So great is the mitzva of circumcision that it overrides the strict halakhot of Shabbat, as circumcision is performed even if the eighth day following the birth of a son occurs on Shabbat, despite the fact that circumcision violates the prohibition of labor on Shabbat. Rabbi Yehoshua ben Korḥa says: Great is the mitzva of circumcision, as is evident from the fact that the punishment of Moses the righteous for not circumcising his son when he was capable of doing so was not postponed for even a full hour (see Exodus 4:24–26). Rabbi Neḥemya says: So great is the mitzva of circumcision that it overrides the prohibitions associated with leprosy. If leprosy is found on the foreskin of an infant, although it is generally prohibited to cut the afflicted area, it is permitted to do so to perform the mitzva of circumcision. Rabbi Yehuda HaNasi says: So great is the mitzva of circumcision that despite all the mitzvot that Abraham our Patriarch did, he was not called wholehearted until he circumcised himself, as it is stated at the time that the mitzva was given to him: “Walk before Me and you should be wholehearted” (Genesis 17:1). Alternatively, so great is the mitzva of circumcision that if not for it the Holy One, Blessed be He, would not have created His world, as it is stated: “Thus says the Lord: 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.