Reference for Keritot 34:25

זו ואין צריך למימר זו

Said Rab Judah in the name of Rab: If there were before a person two pieces, one of permitted fat and the other of heleb, and he ate of one of them and does not know of which of them he ate, he is liable; [if there was] one piece [before him] about which [there was] a doubt whether it was permitted fat or heleb, and he ate of it, he is exempt.

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