Reference for Bekhorot 66:36

דלמא עד כאן לא קאמר ר"מ התם דקא עביד בידים אבל הכא דגרמא כרבי יהושע סבירא ליה

And [perhaps] R'Gamaliel may hold his view only there, in case Elijah should come and pronounce it clean, but here where if he leaves the animal, it dies, he agrees with the Rabbis! And moreover the difference of opinion here is with reference to the interpretation of Scriptural texts, and there too the difference of opinio is with reference to the interpretation of Scriptural texts! [There the difference is with reference to the interpretation of texts].

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