Numbers 31:24
And you shall wash your clothes on the seventh day and be clean, and afterward you may come into the camp.”
Leviticus 11:25
and whoever picks up any of their carcasses shall wash his clothes and be unclean until the evening.
Leviticus 14:9
On the seventh day he shall shave off all his hair: he shall shave his head and his beard and his eyebrows, even all his hair [on his body]. Then he shall wash his clothes and bathe his body in water, and be clean.
Leviticus 15:13
‘When the man with the discharge becomes cleansed from his discharge, he shall count off seven days for his purification; he shall then wash his clothes and bathe his body in running water and will become clean.
Numbers 19:19
Then the clean person shall sprinkle [the water for purification] on the unclean person on the third day and on the seventh day, and on the seventh day the unclean man shall purify himself, and wash his clothes and bathe himself in water, and shall be [ceremonially] clean at evening.