Leviticus 16:4-6

New Revised Standard Version Catholic Edition

⁴ He shall put on the holy linen tunic, and shall have the linen undergarments next to his body, fasten the linen sash, and wear the linen turban; these are the holy vestments. He shall bathe his body in water, and then put them on. ⁵ 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.

⁶ Aaron shall offer the bull as a sin offering for himself, and shall make atonement for himself and for his house.