Reference for Yevamot 41:13

א"ל אביי לרב יוסף הא דאורייתא היא דאורייתא ופירשו רבנן כל התורה נמי פירשו רבנן אלא מדרבנן וקרא אסמכתא בעלמא:

There,<span class="x" onmousemove="('comment',' The orchard. ');">³²</span> the section in front of him, at least, is protected; while here were it not for the prohibition of incest of the second degree, one would have encroached upon the very domain of incest. R. Kahana said, it may be derived from here: Therefore shall ye keep My charge,<span class="x" onmousemove="('comment',' Lev. XVIII, 30, dealing with incest. ');">³³</span>

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