Leviticus 16:7

⁵  And he shall take of the congregation of the children of Israel two kids of the goats for a sin offering, and one ram for a burnt offering.

⁶  And Aaron shall offer his bullock of the sin offering, which is for himself, and make an atonement for himself, and for his house.

⁷  And he shall take the two goats, and present them before the LORD at the door of the tabernacle of the congregation.

⁸  And Aaron shall cast lots upon the two goats; one lot for the LORD, and the other lot for the scapegoat.

⁹  And Aaron shall bring the goat upon which the LORD's lot fell, and offer him for a sin offering.