Rujukan Mishnah untuk Yeremia 9:25: Mishnah Nedarim

[If one says,] “Konam that I do not benefit from the Children of Noah,” he may benefit from Israelites, and he is forbidden to benefit from the nations of the world. [If one says, “Konam] that I do not benefit from the seed of Abraham,” he is forbidden [to benefit] from Israelites, but permitted [to benefit] from the nations of the world. [If one says, “Konam] that I do not benefit from Israelites”, he may buy things from them for more [than their worth] and sell them for less. [If he says, “Konam] if Israelites benefit from me, he must buy from them for less and sell for more [than their worth], if they will listen to him. [If he says, “Konam] that I do not benefit from them, nor they from me”, he may benefit only from non-Jews. [If one says,] “Konam that I do not benefit from the uncircumcised”, he may benefit from uncircumcised Israelites but not from circumcised heathens”; [If one says, “Konam] that I do not benefit from the circumcised,” he is forbidden to benefit from uncircumcised Israelites but not from circumcised non-Jews, because “uncircumcised” is a term applicable only to non-Jews, as it says, “For all the nations are uncircumcised and all the house of Israel are uncircumcised in the heart” (Jeremiah 9:25). And it says, “And this uncircumcised Philistine shall be [as one of them]” (I Samuel 17:6). And it says, “Lest the daughters of the Philistines rejoice, lest the daughters of the uncircumcised exult” (II Samuel 1:20). Rabbi Eleazar ben Azariah says: The foreskin is loathsome, since it is a term of disgrace for the wicked, as it says, “For all the nations are uncircumcised”. Rabbi Ishmael says: Great is circumcision, since thirteen covenants were made upon it. Rabbi Yose says: Great is circumcision, for it overrides the Sabbath. Rabbi Joshua ben Karha says: Great is circumcision for Moses’s punishment for neglecting it was not suspended even for one hour. Rabbi Nehemiah says: Great is circumcision, since it overrides the laws of leprosy. Rabbi says: Great is circumcision, for despite all of the commandments which Abraham fulfilled he was not designated complete until he circumcised himself, as it says, “Walk before me, and be complete” (Genesis 17:1). Another explanation: “Great is circumcision, for were it not for it, the Holy One, Blessed Be He, would not have created the world, as it says, “Were it not for my covenant by day and night, I would not have appointed the ordinances of heaven and earth” (Jeremiah 33:25).