Leviticus 16:23-24

23“When Aaron goes back into the Tabernacle, he must take off the linen garments he was wearing when he entered the Most Holy Place, and he must leave the garments there.

24Then he must bathe himself with water in a sacred place, put on his regular garments, and go out to sacrifice a burnt offering for himself and a burnt offering for the people. Through this process, he will purify himself and the people, making them right with the Lord.