Chabad.org — English translation + Rashi
Torah Temimah points to Zevachim 25a.
E-Daf.com — Zevachim 25a
HebrewBooks / Shas PDF
English: If the blood spilled on the floor and he gathered it — it is invalid, as it is said “and the anointed kohen shall take from the blood of the bull” — blood from the bull he shall receive it.
Miyut of floor-collected blood — blood must be received directly from the bull’s neck into the vessel; blood scooped from the floor is invalid.
Blood must be received directly from the bull’s neck into the vessel; blood scooped from the floor is invalid. The verse’s language “from the blood of the bull” is read as requiring that the reception occur while the blood is still issuing from the animal. Once the blood has fallen to the floor and is later gathered, it no longer qualifies as the blood taken from the bull for the purposes of this chatas.