Commentary for Avodah Zarah 53:12
ולמ"ד המול ימול ליכא והתנן קונם שאני נהנה ממולים אסור בערלי ישראל ומותר במולי עובדי כוכבים אלמא אע"ג דלא מהילי כמאן דמהילי דמו
And to the one who said, “He who is circumcised shall circumcise” he may not? Have we not learned: [He who says,] “I vow not to derive benefit from anything belonging to circumcised persons, must not derive benefit from uncircumcised Israelites, but may derive benefit from circumcised non-Jews: which proves that Israelites who are not circumcised are considered as circumcised.
Daf Shevui to Avodah Zarah
The problem is that the mishnah defines uncircumcised Israelites as if they were circumcised. A Jew who was not circumcised (for medical reasons) should be allowed to circumcise.
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