Leviticus 16:5-8

From the Israelite community he is to take two male goats for a sin offering and a ram for a burnt offering. “Aaron is to offer the bull for his own sin offering to make atonement for himself and his household. Then he is to take the two goats and present them before the LORD at the entrance to the tent of meeting. He is to cast lots for the two goats—one lot for the LORD and the other for the scapegoat.