Reference for Yevamot 140:11

אי הכי אימא (שמות יב, מח) כל ערל לא יאכל בו בו אינו אוכל אבל אוכל הוא בתרומה הא כתיב תושב ושכיר

and that act is one affecting the man's own body; [the uncircumcised] is punishable by <i>kareth</i>;<span class="x" onmousemove="('comment',' If he wilfully neglects the fulfilment of the precept. ');">³⁰</span> the law<span class="x" onmousemove="('comment',' Circumcision. ');">²⁹</span> was in force before the Revelation;<span class="x" onmousemove="('comment',' On Sinai. Lit., 'and it is before (divine) speech'. The commandment concerning circumcision was given to Abraham. V. Gen. XVII, 9ff. ');">³¹</span>

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