Numbers 19:7-10

7“Afterward, the kohen is to wash his clothes and bathe his flesh with the water, and afterward he may come back into the camp. Still the kohen will be unclean until evening.

8Also the one burning it is to wash his clothes and bathe his flesh with the water, and he will be unclean until evening.

9“A clean man is to gather up the ashes of the heifer and put them in a clean place outside the camp. They are to be for the community of Bnei-Yisrael to use as water of purification from sin.

10“The one who gathers the heifer’s ashes is also to wash his clothes as well as be unclean until evening. It will be a permanent statute for Bnei-Yisrael and for the outsider living among them.