Commentary for Yevamot 43:3

א"ל רבינא לרב אשי מאי שנא למעלה דקחשיב לה לאשתו ומאי שנא למטה דלא קחשיב לה לאשתו למעלה דאיסורא מכח אשתו קא אתי חשיב לה למטה דאיסורא לאו מכח אשתו קאתי לא קחשיב לה

or of the daughter of his wife<span class="x" onmousemove="('comment',' Cf. note 8, mutatis mutandis. ');">⁶</span> [is forbidden as incest of the] second degree; the fourth generation<span class="x" onmousemove="('comment',' From his wife. ');">⁷</span> through his father-in-law<span class="x" onmousemove="('comment',' His father-in-law's mother's mother who Is the fourth generation from his wife. (A father-in-law's mother comes under the prohibition of actual incest). ');">⁸</span>

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