Reference for Gittin 132:8

אלא לשמואל הא קא מיבעיא ליה האי כתובו אי כתב ידן אי כתב הגט

AND WRITE AND GIVE IT. IF A MAN SAYS TO TEN PERSONS, WRITE A GET AND DELIVER IT TO MY WIFE, ONE WRITES, AND TWO SIGN AS WITNESSES. [IF HE SAID,] ALL OF YOU WRITE, ONE WRITES AND ALL SIGN. CONSEQUENTLY IF ONE OF THEM DIES, THE GET IS INVALID.

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