Leviticus 16:3-5 Aaron is to enter the sacred place with a young bull for a sin offering and a ram for a whole burnt offering.

ISV⁽ⁱ⁾ ³ Aaron is to enter the sacred place with a young bull for a sin offering and a ram for a whole burnt offering. ⁴ He is to wear a sacred linen tunic and linen undergarments that will cover his genitals. He is to clothe himself with a sash and wrap his head with a linen turban. Because they are sacred garments, he is to wash himself with water before putting them on.”
⁵ The Atonement and Scapegoat Lots“He is to take two male goats for a sin offering and one ram for a whole burnt offering from the assembly of the Israelis.