Reference for Yevamot 61:1

כיון דקא מצרכת חליצה מידע ידעי דחומרא בעלמא הוא א"ה גירושין נמי ליתני וליצרכה חליצה ומידע ידעי דחומרא בעלמא הוא

— Since she is required to perform <i>halizah</i> it is sufficiently known that it<span class="x" onmousemove="('comment',' The prohibition to take her in levirate marriage. ');">¹</span> is a mere restriction.<span class="x" onmousemove="('comment',' And is not due to the fact that the betrothal of the forbidden relative was valid. ');">²</span> If so, let him, in the case of divorce also,<span class="x" onmousemove="('comment',' As in the case of betrothal. ');">³</span>

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