Reference for Chullin 167:7

אי כר' שמעון דאמר

are subject to the law of standing up whilst being appraised? - R'Joseph answered: The Tanna of our Mishnah is Rabbi who incorporates the views of both these Tannaim: with regard to a slaughtering which does not render fit [for food] he adopts the view of R'Simeon, and with regard to the law of standing up whilst being appraised he adopts the view of R'Meir.

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