Reference for Bekhorot 36:5

לדידך אודי לי מיהא היכא דחליפין ביד כהן דעשו שאינו זוכה כזוכה

But according to your view, at least admit that where the priest has [a beast] in its stead, [the Sages] put one who had not taken possession in the position of one who had taken possession.

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