Leviticus 16:6-9

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

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

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

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