Talmud for Avodah Zarah 53:5
דתניא רבי יהודה הנשיא אומר מנין למילה בעובד כוכבים שהיא פסולה ת"ל ואתה את בריתי תשמור
R. Judah the Prince. For it has been taught: R. Judah the Prince says: From where do we learn that circumcision performed by a non-Jew is invalid? Scripture says, “And as for you, you shall keep my covenant.”
Jerusalem Talmud Shabbat
It was stated88Babli Avodah zarah 27a, Tosephta Avodah zarah 3:13.: “A Jew may circumcise a Samaritan but a Samaritan may not circumcise a Jew since he circumcises in the name of Mount Gerizim, the words of Rebbi Jehudah. Rebbi Yose said to him, where do we find that circumcision needs intent? Let him continue to circumcise in the name of Mount Gerizim until he dies!”
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