Leviticus 9:7-9

⁷Then Moses/I said to Aaron, “Come to the altar and sacrifice the animal that is your offering to enable you to be forgiven for the sins you have committed, and the animal that will be completely burned there. Because of those offerings, God will forgive you and the people for the sins that you have committed DOU. Do those things that Yahweh has commanded.”

⁸So Aaron came close to the altar and slaughtered the calf to be an offering for his sins.

⁹His sons brought its blood to him in a bowl. He dipped his finger into the blood and put some of it on the projections at the corners of the altar. He poured out the rest of the blood at the base of the altar.