Leviticus 9:1-8

After the ordination ceremony, on the eighth day, Moses called together Aaron and his sons and the elders of Israel. He said to Aaron, “Take a young bull for a sin offering and a ram for a burnt offering, both without defects, and present them to the LORD. Then tell the Israelites, ‘Take a male goat for a sin offering, and take a calf and a lamb, both a year old and without defects, for a burnt offering. Also take a bull and a ram for a peace offering and flour moistened with olive oil for a grain offering. Present all these offerings to the LORD because the LORD will appear to you today.’” So the people presented all these things at the entrance of the Tabernacle, just as Moses had commanded. Then the whole community came forward and stood before the LORD. And Moses said, “This is what the LORD has commanded you to do so that the glory of the LORD may appear to you.” Then Moses said to Aaron, “Come to the altar and sacrifice your sin offering and your burnt offering to purify yourself and the people. Then present the offerings of the people to purify them, making them right with the LORD, just as he has commanded.” So Aaron went to the altar and slaughtered the calf as a sin offering for himself.