Reference for Ketubot 189:13

ת"ש כתב לראשון ולא חתמה לו לשני וחתמה לו איבדה כתובתה דברי ר"מ

Come and hear: [If a husband] wrote a deed for the first buyer, and she did not sign on it, [and then he wrote a deed] for a second buyer and she did sign on it, she has thereby lost [her claim to] her kethubah, the words of R. Meir.

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