Reference for Pesachim 90:22

מי דמי התם בשיעורא תליא מילתא הכא בקפידא תליא מילתא

[if] within three days [before Passover], he is bound to remove it;<span class="x" onmousemove="('comment',' Because it is still regarded as flour, and of course it is leaven.');">²⁰</span> [if] before three days, he is not bound to remove it.<span class="x" onmousemove="('comment',' Because by Passover it will be so spoiled through the odour of the trough, even if there are no hides in it, that it will not be regarded as flour.');">²¹</span>

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