Talmud for Yevamot 41:17
אי הכי אשת חמיו נמי תימא אני מותרת לך ובתי אסורה לך דהויא אחות אשתו הא פסיקא ליה הא לא פסיקא ליה:
wife and his<span class="x" onmousemove="('comment',' The step-father's. ');"><sup>42</sup></span> daughter. The wife of his step-son may say to him, 'I am permitted to you though daughter is forbidden to you'. Is not the daughter of, his step-son forbidden, it being written in the Scriptures, Her son's daughter or her daughters daughter?<span class="x" onmousemove="('comment',' Lev. XVIII, 17. Why include it among incest of the second degree? ');"><sup>43</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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