Reference for Ketubot 162:4

ההוא גברא דנפלה ליה יבמה בפומבדיתא בעי אחוה למפסלה לה בגיטא מיניה

There once was a man in Pumbedita whose sister-in-law became liable for levirate marriage with him. His [younger] brother wanted to cause her to be forbidden to marry him by giving her a get. He [the eldest brother] said to him,

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