Reference for Yevamot 217:11

בעא מיניה רבא מרב נחמן צרתה מהו אמר ליה היא גופה גזירה ואנן ניקום וניגזור גזירה לגזירה

Raba enquired of R. Nahman: What is [the law<span class="x" onmousemove="('comment',' According to R. Eleazar. ');">³³</span> in respect of] her<span class="x" onmousemove="('comment',' A divorced minor whom the husband remarried when she was of age. ');">³⁴</span> rival?<span class="x" onmousemove="('comment',' Is her rival permitted levirate marriage? ');">³⁵</span> — The other replied: [The prohibition against] herself is a preventive measure;<span class="x" onmousemove="('comment',' Against the possibility of contracting levirate marriage with an 'orphan' in her father's lifetime. ');">³⁶</span>

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