Reference for Pesachim 90:7

פשיטא מהו דתימא זמנא דאטיף ומטי להתם קא משמע לן

Now, since R'Simeon B'Eleazar said, 'He has nullified it', it follows that the fi Tanna holds that he has not nullified it. This proves that he holds, wherever there is as much as an olive, even if he nullifies it, it is not nullified.

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