Leviticus 9:7-8

9:7 Moses then said to Aaron, “Approach the altar and make your sin offering and your burnt offering, and make atonement on behalf of yourself and on behalf of the people; and also make the people’s offering and make atonement on behalf of them just as the Lord has commanded.”

The Sin Offering for the Priests

9:8 So Aaron approached the altar and slaughtered the sin offering calf which was for himself.