Leviticus 9:7-9

New Revised Standard Version, Anglicised

⁷ Then Moses said to Aaron, ‘Draw near to the altar and sacrifice your sin-offering and your burnt-offering, and make atonement for yourself and for the people; and sacrifice the offering of the people, and make atonement for them; as the Lord has commanded.’

⁸ Aaron drew near to the altar, and slaughtered the calf of the sin-offering, which was for himself. ⁹ The sons of Aaron presented the blood to him, and he dipped his finger in the blood and put it on the horns of the altar; and the rest of the blood he poured out at the base of the altar.