Reference for Ketubot 189:7

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

For it was taught: [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.

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow