Reference for Ketubot 152:11

דיהיב טבח דמי ומאי פסקא סתמא דמילתא כמה דלא יהיב איניש זוזי לא יהיב איניש חיותא:

[This is a case] where the butcher has already paid the price. But how can you be so sure? It is the usual practice that so long as one man does not pay the price the other does not give his beast.

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