Reference for Bekhorot 36:19

ר' מאיר אפי' ספק מעשר מחייב והא דמיפלגי בחליפין להודיעך כחו דרבי יוסי דפטר אפי' היכא דכהן בא עליו משני צדדין קא משמע לן:

- You might have assumed that R'Meir, even in the case of a doubtfully tithed animal, makes him liable, and the reason why they differ [in the matter where the priest has a beast] in its stead, is to show how far R'Jose is prepared to go, since he exempts even where the priest can make a claim upon him from two sides.

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