Leviticus 9:1-5

1And it came to pass on the eighth day, that Moses called Aaron and his sons, and the elders of Israel; 2And he said unto Aaron, Take thee a young calf for a sin offering, and a ram for a burnt offering, without blemish, and offer them before the Lord. 3And unto the children of Israel thou shalt speak, saying, Take ye a kid of the goats for a sin offering; and a calf and a lamb, both of the first year, without blemish, for a burnt offering; 4Also 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.

5And they brought that which Moses commanded before the tabernacle of the congregation: and all the congregation drew near and stood before the Lord.