Leviticus 16:3-5

“This is the procedure for Aaron when he enters the Holy Place: He will bring a young bull for an Absolution-Offering and a ram for a Whole-Burnt-Offering; he will put on the holy linen tunic and the linen underwear, tie the linen sash around him, and put on the linen turban. These are the sacred vestments so he must bathe himself with water before he puts them on. Then from the Israelite community he will bring two male goats for an Absolution-Offering and a Whole-Burnt-Offering.