Leviticus 9:6-8

King James Version

⁶ And Moses said, This is the thing which the Lord commanded that ye should do: and the glory of the Lord shall appear unto you.

⁷ And Moses said unto Aaron, Go unto the altar, and offer thy sin offering, and thy burnt offering, and make an atonement for thyself, and for the people: and offer the offering of the people, and make an atonement for them; as the Lord commanded.

⁸ Aaron therefore went unto the altar, and slew the calf of the sin offering, which was for himself.