Leviticus 8:15

8:15 and he slaughtered it. Moses then took the blood and put it all around on the horns of the altar with his finger and decontaminated the altar, and he poured out the rest of the blood at the base of the altar and so consecrated it to make atonement on it.

Leviticus 9:18

9:18 Then he slaughtered the ox and the ram – the peace offering sacrifices which were for the people – and Aaron’s sons handed the blood to him and he splashed it against the altar’s sides.