Commentary for Yevamot 40:12

אשת אחיו שהיה בעולמו לא תתייבם גזרה משום אשת אחיו שלא היה בעולמו בישיבה תלא רחמנא מידע ידיע

an erusin widow is forbidden<span class="x" onmousemove="('comment',' To a High Priest. ');">²⁰</span> as a preventive measure against the marriage of a nissu'in widow.<span class="x" onmousemove="('comment',' Not because those forbidden by a negative precept may not contract levirate marriage. Pentateuchally, in fact, they may; and this is the reason why marital intercourse with such consummates marriage, as stated supra. ');">²¹</span>

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