Tractate Yoma - Chapter 7 - Mishnah 4 יומא פרק ז׳ משנה ד׳

He then sanctified his hands and feet, stripped off his clothes, went down and immersed himself, came up and dried himself. They brought him the white clothes, he put them on and sanctified his hands and his feet. Then he went in to bring out the ladle and the fire-pan. He then sanctified his hands and feet, stripped off his clothes, went down and immersed himself, came up and dry himself. They brought him the golden clothes, he put them on, sanctified his hands and feet, and went in to burn up the dusk incense, and takes care of the lamp. He sanctified his hands and feet and stripped, went down, immersed himself, came up and dried himself. They brought him his own clothes and he put them on. And they would accompany him to his house. And he would make a day of festivity for his friends whenever he came out of the Holy [of Holies] in peace.