Reference for Bava Metzia 36:10

בשלמא רבה לא אמר כר' זירא מתניתין אלימא ליה לאקשויי אלא רבי זירא מ"ט לא אמר כרבה

At all events it says, 'When the husband admits [its genuineness] it shall be returned to the woman' — [obviously] even after a long time! — And [R. Zera] explained it [by saying]: There<span class="x" onmousemove="('comment',' In the Mishnah, which says that if found after a long interval the bill of divorcement is invalid. ');">¹⁰</span>

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