Leviticus 9:5-7

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

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

⁷And Moses said to Aaron, Go to 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.