Reference for Zevachim 125:5

בן בתירא אומר מנין שאם קמץ בשמאל שיחזיר ויקמוץ בימין ת"ל משם ממקום שקמץ כבר

Because it says, 'thence', [which means,] from the place whence he had already taken a fistful?<span class="x" onmousemove="('comment',' Thus it intimates that it is sometimes necessary to take the fistful twice, which is only possible in this case.');">⁷</span> Some state that he [R'Jeremiah] raised the objection, and answered it himself; others state.

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