Reference for Pesachim 80:7

מאן י"א

He may even put in the vinegar [first] and then add the flour.<span class="x" onmousemove="('comment',' Although the vinegar becomes mixed with the rest of the dish when it is put in first, it can still prevent the fermenting of the flour.');">¹⁵</span> Who is 'some say'? Said R'Hisda, It is R'Judah.

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