Leviticus 9:5-7

⁵And they brought that which Moses had commanded before the tabernacle of the congregation: and all the congregation drew near and stood before the Lord.

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.