Reference for Yevamot 41:15

ואשת חורגו אומרת לו אני מותרת לך ובתי אסורה לך

— It is Pentateuchal' but the Rabbis have expounded it.<span class="x" onmousemove="('comment',' Hence it must come under the second degree. ');">³⁷</span> All the Torah, surely- was expounded by the Rabbis!<span class="x" onmousemove="('comment',' And yet no one would describe those laws as of the second degree! ');">³⁸</span> But [the fact is that the prohibition<span class="x" onmousemove="('comment',' Of incest of the second degree. ');">³⁹</span>

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