Leviticus 9:6-9

⁶And Moses said, This thing which the Lord hath commanded shall ye do: and then will the glory of the Lord appear unto you.

⁷And Moses said unto Aaron, Draw near unto the altar, and prepare thy sin-offering, and thy burnt-offering, and make an atonement for thyself, and for the people; and prepare the offering of the people, and make an atonement for them; as the Lord hath commanded.

⁸And Aaron drew near unto the altar; and he slew the calf of the sin-offering, which was for himself.

⁹And the sons of Aaron brought the blood unto him; and he dipped his finger in the blood, and put it upon the horns of the altar; and the remaining blood he poured out at the bottom of the altar.