Talmud 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. ');"><sup>32</sup></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. ');"><sup>33</sup></span>
Jerusalem Talmud Yevamot
How can one prove secondary prohibitions? Rebbi Ḥuna said: “These86Lev. 18:27, כִּי אֶת־כָּל־הַתּוֹעֵבוֹת הָאֵל “all these abominations”, these should have been written הָאֵלֶּה; the short form is taken as a hint of the root אל “power” (the meaning of the word commonly but wrongly translated as “God”).”, the strong ones. This implies that there are weaker ones87In the Babli, 21a, the argument is in the name of Rava.. The following are the secondary prohibitions88Babli 21a, Tosephta 3:1 (parallels the Babli in content and the Yerushalmi in language), Derekh Ereṣ Rabba 1, extended to contain most of the next paragraph.: His paternal grandmother and his maternal grandmother, his paternal grandfather’s wife and his maternal grandfathers wife, his grandson’s wife whether from son or daughter, the wife of his mother’s brother and the wife of his father’s maternal brother.
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