Reference for Bekhorot 73:30

ואלו הן דברים שאין הנפש קצה בהן

R'Simeon B'Eleazar, however, says: In the case of objects for which a man has a loathing, he must return the money to them, [as there was no benefit to them after knowing], whereas in the case of objects for which a man has not a loathing, he deducts from the price [what had been eaten].

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