Leviticus 16:6

3 Herewith shall Aaron come into the holy place: with a young bullock for a sin-offering, and a ram for a burnt-offering.

4 He shall put on the holy linen coat, and he shall have the linen breeches upon his flesh, and shall be girded with the linen girdle, and with the linen mitre shall he be attired: they are the holy garments; and he shall bathe his flesh in water, and put them on.

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

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

7 And he shall take the two goats, and set them before Jehovah at the door of the tent of meeting.

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

9 And Aaron shall present the goat upon which the lot fell for Jehovah, and offer him for a sin-offering.