Reference for Avodah Zarah 26:5

וליהוי כמטיל מום בבעל מום דאע"ג דלא חזי להקרבה אסור בעל מום נהי דלא חזי לגופיה לדמי חזי לאפוקי הכא דלא לדמי חזי ולא לגופיה חזי

But let it be regarded as inflicting a blemish on a blemished animal which, even though not fit for a sacrificial purpose, is forbidden! An animal which had been blemished, while it cannot be used for sacrifice, the money obtained for it may be used; but this excludes our case where the animal is not fit for the money obtained for it nor for actual sacrifice.

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