Charles Ellicott Commentary Leviticus 16:28

"And he that burneth them shall wash his clothes, and bathe his flesh in water, and afterward he shall come into the camp." — Leviticus 16:28 (ASV)

And he that burneth. —That is, those who carried the carcasses and burned them, like the messenger who conducted the sin-laden goat, contracted defilement from the atoning victims. They had, therefore, to undergo the same ablutions.