Leviticus 16:3-5

3This is how Aaron is to enter the Holy Place: with a young bull for a sin offering and a ram for a burnt offering. 4He is to wear the sacred linen tunic, with linen undergarments. He must tie a linen sash around him and put on the linen turban. These are holy garments, and he must bathe himself with water before he wears them. 5And he shall take from the congregation of Israel two male goats for a sin offering and one ram for a burnt offering.