Matthew Poole and continuators on Leviticus 16:24

24 And he shall wash his flesh with water in the holy place , and put on his garments , and come forth, and offer his burnt-offering, and the burnt-offering of the people, and make an atonement for himself, and for the people.

Either in the laver appointed for that purpose. Or, in some other vessel within the holy place, because after he had washed in it he is said to come forth.

Not his ordinary Priestly linnen garments, for he was to leave them in the Tabernacle, ver. 23. but the High-priestly garments, called his garments properly and peculiarly, and by way of distinction from the former garments, which are called holy garments, ver. 4. and the linnen garments, ver. 23. but never his garments, as these are. And this change of his garments was not without cause. For the common Priestly garments were more proper and fit for him in the former part of his ministration, both because he was to appear before the Lord in the most holy place to humble himself and make atonement for his own and for the peoples sins, and therefore his humblest and meanest attire was most fit▪ and because he was to lay his hands upon that goat on which all their sins were put, by which touch both he and his garments would be in some sort defiled, and therefore as we read here that he washed himself or his flesh▪ so we may well presume his linnen garments were laid by for the washing, as the cloaths [illegible: 1+ letters]f him who carried away the scape-goat were washed ver. 26. And the High-priestly garments were most proper for the latter part of his work, which was of another nature.