Reference for Yoma 95:5

מה"מ דת"ר (ויקרא ד, ה) ולקח מדם הפר מדם הנפש ולא מדם העור ולא מדם התמצית

and he gathered it up, it is invalidated. But if it was poured out of the vessel on the pavement and he gathered it up, it is usable.

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