Leviticus 9:5-7

⁵And they took the things ordered by Moses, before the Tent of meeting, and all the people came near, waiting before the Lord.

⁶And Moses said, This is what the Lord has said you are to do; and you will see the glory of the Lord.

⁷And Moses said to Aaron, Come near to the altar and make your sin-offering and your burned offering to take away your sin and the sin of the people, and make the people's offering to take away their sin; as the Lord has given orders.