Commentary for Yevamot 56:12

מ"ט כיון דבתו באונסין הוא דמשכחת לה בנשואין לא משכחת לה

for what difference is there whether it relates to one or to two! — It might have been thought that only where there is the necessity of providing for a preventive measure against a second brother do we not say that the prohibition by a commandment takes the same rank as a prohibition by the law of incest,<span class="x" onmousemove="('comment',' V. supra p. 174. n. 6. ');">¹⁹</span> but that where there is no necessity to provide against a second brother we do say that in the case of the one brother the prohibition by a commandment is to be given the same force as the prohibition by the law of incest, and that also in the case of the other brother the prohibition by a commandment is to be given the same force as the prohibition by the law of incest, and that the sisters may consequently be taken in levirate marriage; hence we were taught [that such an assumption is not to be made].

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