Leviticus 9:8
Aaron therefore went unto the altar, and slew the calf of the sin offering,
More from Leviticus 9
And it came to pass on the eighth day, that Moses called Aaron and his sons, and the elders of Israel;
And 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.
And 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;
Also 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
And they brought that which Moses commanded before the tabernacle of the congregation: and all the congregation drew near and stood before the LORD.