Commentary for Yevamot 155:20

וכי תימא משום דרבי יצחק דאמר רבי יצחק דבר תורה רובו ומקפיד עליו חוצץ רובו שאינו מקפיד עליו אינו חוצץ

if one objects to it,<span class="x" onmousemove="('comment',' To the object or substance that causes the interposition. ');">⁶⁷</span> constitutes legally an interposition,<span class="x" onmousemove="('comment',' And invalidates the immersion. ');">⁶⁸</span> and if one does not object to,<span class="x" onmousemove="('comment',' The presence of the interposition, when, e.g., it is necessary for it to remain there. ');">⁶⁹</span> no legal interposition is constituted;<span class="x" onmousemove="('comment',' 'Er. 4b, Nid. 67b. As the embryo must necessarily remain within its mother's body during the period of conception, it cannot possibly object, so to speak, to its mother's interposition. ');">⁷⁰</span>

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