Reference for Yevamot 76:2

זיקת ארוסה עושה ספק ארוסה דאי ס"ד ודאי ארוסה מודים ב"ה שמוכרת ונותנת וקיים

Consequently<span class="x" onmousemove="('comment',' Since in the case of a definite betrothal Beth Hillel, contrary to the opinion of Beth Shammai do not allow the widow the right of sale or gift, while in the first clause of our Mishnah they do. ');">³</span> it must be inferred that the levirate bond of a betrothed woman renders her 'doubtfully betrothed'.<span class="x" onmousemove="('comment',' Hence Beth Shammai, who concede to the widow the right to sell and to give away even where her betrothal was certain, with all the more reason concede such rights to the widow spoken of in the first clause of our Mishnah where her betrothal is only doubtful. Beth Hillel, too, since in the case of a definite betrothal they agree that a sale or gift that had already taken place is valid, may rightly concede to the widow in the case of doubtful betrothal the full rights of selling and giving away. ');">⁴</span>

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