Commentary for Yevamot 56:3
ותתייבם כיון דמדאורייתא רמיא קמיה קא פגע באחות זקוקתו סד"א משום מצוה עבוד רבנן קמ"ל:
Since it might have been assumed that the prohibition by virtue of a commandment shall take the same rank as the prohibition by the law of incest<span class="x" onmousemove="('comment',' As the one is not regarded as a zekukah so neither is the other. ');"><sup>4</sup></span> and [her sister] should, therefore, be taken in levirate marriage, hence we were taught [that the law is not so].
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