Reference for Avodah Zarah 108:2

אלא כיון דעבד בהו מעשה איתסרו להו הכא נמי כיון שעשה בה מעשה אסרה

Since, however, an act [of idolatrous worship] was performed on them, they became prohibited. So too here [with the animal] since he performed an act [of idolatrous worship] on it, he has rendered it prohibited.

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