Talmud for Avodah Zarah 53:3
אמר לו רבי יוסי וכי היכן מצינו מילה מן התורה לשמה אלא מל והולך עד שתצא נשמתו
R. Yose said to him: Where in the Torah do we find that circumcision must be performed specifically for its purpose? Rather he may go on performing it until the day of his death.
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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