Reference for Pesachim 90:23

אמר רב יהודה אימא ולענין הטומאה אינו כן

Said R'Nathan: When is this said? If he did not put hides into it; but if he put hides into it, even [if it is] within three days, he is not bound to remove [the flour].<span class="x" onmousemove="('comment',' Because the hides utterly spoil it.');">²²</span>

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