Leviticus 16:3-7

But in this way Aaron shall come into the Holy Place: with a bull from the herd for a sin offering and a ram for a burnt offering. He shall put on the holy linen coat and shall have the linen undergarment on his body, and he shall tie the linen sash around his waist, and wear the linen turban; these are the holy garments. He shall bathe his body in water and then put them on. And he shall take from the congregation of the people of Israel two male goats for a sin offering, and one ram for a burnt offering. “Aaron shall offer the bull as a sin offering for himself and shall make atonement for himself and for his house. Then he shall take the two goats and set them before the LORD at the entrance of the tent of meeting.