Reference for Pesachim 221:9

ואי ממצעין מאי תקנתיה אמר רב פפא נפתח באל ונפסיק באל

This was said only if he did not interpose dust<span class="x" onmousemove="('comment',' I.e., he did not scatter dust upon the water before passing over it.');">⁶</span> or spit into it; but if h interposed dust or spit into it, it does not matter.

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