Reference for Chullin 6:45
אביי לא אמר כרבא התם לא נגע הכא נגע
This applies only where an Israelite was standing over him [at the time]; but if he [the Israelite] came and found that the Cuthean had already slaughtered, he cuts off an olive's bulk of the flesh and gives it to him; if he ate it, then we may eat of his slaughtering; if he did not, then we may not eat of his slaughtering.
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