Numbers 31:24
You shall wash your clothes on the seventh day, and you shall be clean; and afterward you shall come into the camp."
Leviticus 11:25
Whoever carries any part of their carcass shall wash his clothes, and be unclean until the evening.
Leviticus 14:9
It shall be on the seventh day, that he shall shave all his hair off his head and his beard and his eyebrows, even all his hair he shall shave off. He shall wash his clothes, and he shall bathe his body in water, then he shall be clean.
Leviticus 15:13
"'When he who has a discharge is cleansed of his discharge, then he shall count to himself seven days for his cleansing, and wash his clothes; and he shall bathe his flesh in running water, and shall be clean.
Numbers 19:19
and the clean person shall sprinkle on the unclean on the third day, and on the seventh day: and on the seventh day he shall purify him; and he shall wash his clothes, and bathe himself in water, and shall be clean at evening.