Leviticus 16:5-9

And he shall take from the congregation of the sons of Israel two male goats as a sin offering, and one ram as a burnt offering.

Then Aaron shall offer the bull as the sin offering, which is for himself, so that he may make atonement for himself and for his household.

He shall then take the two goats and present them before the Lord at the doorway of the tent of meeting.

Aaron shall cast lots for the two goats, one lot for the Lord and the other lot for the scapegoat.

Then Aaron shall offer the goat on which the lot for the Lord fell, and make it a sin offering.