Leviticus 9:1-8

Now it came about on the eighth day that Moses called Aaron and his sons and the elders of Israel; and he said to Aaron, “Take for yourself a calf, a bull, for a sin offering and a ram for a burnt offering, both without defect, and offer them before the LORD. Then to the sons of Israel you shall speak, saying, ‘Take a male goat for a sin offering, and a calf and a lamb, both one year old, without defect, for a burnt offering, and an ox and a ram for peace offerings, to sacrifice before the LORD, and a grain offering mixed with oil; for today the LORD will appear to you.’ ” So they took what Moses had commanded to the front of the tent of meeting, and the whole congregation came near and stood before the LORD. Moses said, “This is the thing which the LORD has commanded you to do, that the glory of the LORD may appear to you.” Moses then said to Aaron, “Come near to the altar and offer your sin offering and your burnt offering, that you may make atonement for yourself and for the people; then make the offering for the people, that you may make atonement for them, just as the LORD has commanded.” So Aaron came near to the altar and slaughtered the calf of the sin offering which was for himself.