Reference for Yevamot 109:4

ואשת אח גופה מנ"ל דתניא (ויקרא יח, טז) ערות אשת אחיך לא תגלה בין מן האב בין מן האם

[should be inferred] from one effected through betrothal!<span class="x" onmousemove="('comment',' The aunt whose relationship to him is due to her betrothal by his uncle. ');">⁹</span> — The deduction<span class="x" onmousemove="('comment',' In respect of a wife's sister. ');">⁷</span> is rather made from a brother's wife, since her relationship<span class="x" onmousemove="('comment',' Like that of his wife's sister. ');">¹⁰</span>

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