Reference for Pesachim 31:15

ת"ש (ויקרא יא, לו) אך מעין ובור מקוה מים יהיה טהור מאי יהיה טהור מטומאתו

It makes [solid foodstuffs] fit [to become unclean].<span class="x" onmousemove="('comment',' For solids cannot be defiled unless moisture has previously been upon them. The words, 'it shall be unclean' thus refer to 'of all the food etc. 'with which the verse begins.');">¹⁸</span> [You say].'

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