Reference for Pesachim 32:2

אמר ליה ר' זירא הנח לדם התמצית דאפי' בחולין נמי לא מכשיר

To this R'Samuel B'Ammi demurred: Behold the last-drained blood,<span class="x" onmousemove="('comment',' I.e., the blood which flows out slowly');">²</span> which is poured out like water,<span class="x" onmousemove="('comment',' It is not fit for sprinkling.');">³</span>

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