Reference for Ketubot 195:7

כי האי דההוא גברא דאפקידו גביה כיסתא דיתמי אזל שמה לנפשיה בארבע מאה זוזי אייקר קם בשית מאה

As was the case with a certain man with whom corals belonging to orphans had been deposited. He went and assessed them on his own behalf for four hundred zuz, and when later its price rose to six hundred zuz,

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