Reference for Yevamot 218:13

אמר ליה רבין בריה דרב נחמן הא מילתא דקטנה מיתלא תליא וקיימא אי בעל אין אי לא בעל לא דאמרה הוא עדיף מינאי ואנא עדיפנא מיניה

[and consequently] only if cohabitation has taken place is the elder sister exempt,<span class="x" onmousemove="('comment',' Lit., 'yes'. Because it is the 'betrothal' that severs the levirate bond which existed between the levir and the elder sister from the moment his brother died. ');">³³</span> but if no cohabitation has taken place she is not. Said R. Shesheth: It seems<span class="x" onmousemove="('comment',' Lit., 'I would say'. ');">³⁴</span>

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