Reference

Leviticus 9:6

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.
4

Also a bullock and a ram for peace offerings, to sacrifice before the Lord; and a meat offering mingled with oil: for to day the Lord will appear unto you.

5

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

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.