TSK · Numbers 31:24

When the seventh day comes he must shave all his hair– his head, his beard, his eyebrows, all his hair– and he must wash his clothes, bathe his body in water, and so be clean.

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.