Commentary for Yevamot 92:13

מהו דתימא לר' יוסי מילה עיקר והתם הוא דלא הואי מילה בפנינו אבל היכא דהויא מילה בפנינו אימא ליטבל זה בשבתא קמ"ל דרבי יוסי תרתי בעי

is because the circumcision had not been performed in our presence<span class="x" onmousemove="('comment',' And may be presumed to have been invalid. ');">³⁶</span> but where the circumcision had taken place in our presence<span class="x" onmousemove="('comment',' And is known to us to have been carried out in accordance with the requirements of the law. ');">³⁷</span> it might have been assumed that a proselyte in such circumstances<span class="x" onmousemove="('comment',' Lit., 'this'. ');">³⁸</span>

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