Reference for Chullin 164:58

אילימא רבנן דפליגי עליה דסומכוס

For it was taught: And he shall let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire.<span class="x" onmousemove="('comment',' Ex. XII, 10. This law refers to the Passover offering.');">²⁷</span>

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