Commentary for Yevamot 55:14

צריכא דאי אשמועינן התם משום דליכא למיגזר משום שני אבל הכא דאיכא למיגזר משום שני אימא לא

Now, why [should both sisters be forbidden]?<span class="x" onmousemove="('comment',' To marry the other levir. ');">³⁷</span> Let the son-in-law undertake the duty of marrying first that sister who is not his mother-in-law,<span class="x" onmousemove="('comment',' That widow is permitted to him, because she is neither his forbidden relative nor the sister of his zekukah, since a forbidden relative is not a zekukah. ');">³⁸</span> and his mother-in-law, in relation to the other levir, would thereby come into the same category as a sister-in-law that was permitted,<span class="x" onmousemove="('comment',' Since at the time she became subject to the levirate marriage she was not the sister of a zekukah. ');">³⁹</span>

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