Leviticus 9:7-9

Darby Translation

⁷ And Moses said unto Aaron, Go to the altar, and offer thy sin-offering, and thy burnt-offering, and make atonement for thyself, and for the people; and offer the offering of the people, and make atonement for them, as Jehovah has commanded.

⁸ And Aaron went to the altar and slaughtered the calf of the sin-offering which was for himself;

⁹ and 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 poured out the blood at the bottom of the altar.