Leviticus 16:5-9

5“Then he is to take from the congregation of Bnei-Yisrael two he-goats for a sin offering and one ram for a burnt offering.

6Then Aaron is to offer the bull for the sin offering which is for himself and make atonement for himself and his house.

7Then he is take the two goats and present them before Adonai at the entrance of the Tent of Meeting.

8Aaron will then cast lots for the two goats—one lot for Adonai, and the other lot for the scapegoat.

9Aaron is to present the goat on which the lot for Adonai fell and make it a sin offering.