Leviticus 16:6-10

“Aaron will offer the bull for his own Absolution-Offering in order to make atonement for himself and his household. Then he will set the two goats before GOD at the entrance to the Tent of Meeting and cast lots over the two goats, one lot for GOD and the other lot for Azazel. He will offer the goat on which the lot to GOD falls as an Absolution-Offering. The goat on which the lot for Azazel falls will be sent out into the wilderness to Azazel to make atonement.