Numbers 19:8

19:8 The one who burns it must wash his clothes in water and bathe himself in water. He will be ceremonially unclean until evening.

Numbers 19:19

19:19 And the clean person must sprinkle the unclean on the third day and on the seventh day; and on the seventh day he must purify him, and then he must wash his clothes, and bathe in water, and he will be clean in the evening.