Reference for Makkot 32:4

כדרבי ישמעאל דאמר אף מפריש מן העיסה ולר' ישמעאל נמי משכחת לה דאכל עיסה

[Because Rebbi Yochanon holds] according to Rebbi Yishmael who says, He may even separate pe'uh from the dough. But according to Rebbi Yishmael a way to nullify the commandment can also be found, in a case where he eats the dough?

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