Leviticus 9:1

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;