Reference for Chullin 160:3

מכדי שמעינן ליה לרבי שמעון דאמר

Moreover, it reads: IF BOTH ANIMALS WERE UNCONSECRATED [AND WERE SLAUGHTERED] INSIDE THE SANCTUARY, BOTH ANIMALS ARE INVALID, AND [HE WHO SLAUGHTERED] THE SECOND INCURS FORTY STRIPES.

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