Talmud for Avodah Zarah 53:8
איתמר מנין למילה בעובד כוכבים שהיא פסולה דרו בר פפא משמיה דרב אמר ואתה את בריתי תשמור ורבי יוחנן המול ימול
It has been stated: From where do we know that circumcision performed by a non-Jew is invalid? Daru b. Papa said in the name of Rav: [From the words,] “And as for you, you shall keep my covenant.” While R. Yohanan: “Circumcise, you shall surely circumcise” [which he reads as if it says “he who is circumcised shall circumcise.”
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