Reference for Yevamot 216:17

פשיטא הוא ניהו דמכרת ברמיזותיו וקריצותיו אבל אחיו לא מהו דתימא ליגזר האי אטו האי קמ"ל

But the enquiry was in this manner: If [a minor] was the wife of his mother's brother, and consequently forbidden to him as a relative of the second degree,<span class="x" onmousemove="('comment',' Forbidden by Rabbinic law. Cf. supra 21a. ');">³⁹</span> and his paternal brother [subsequently] married her<span class="x" onmousemove="('comment',' After the death of her first husband. ');">⁴⁰</span> and died,<span class="x" onmousemove="('comment',' Without issue, so that she became subject to levirate marriage with his paternal brother. ');">⁴¹</span>

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