Numbers 31:24
And wash your clothes the seventh day, and then ye are clean. And afterward come into the host."
Leviticus 11:25
and whosoever beareth the carcass of them, shall wash his clothes and shall be unclean until even.
Leviticus 14:9
When the seventh day is come, he shall shave off all his hair both upon his head and his beard and on his brows: and even all the hair that is on him, shall be shaven off. And he shall wash his clothes and his flesh in water, and then he shall be clean.
Leviticus 15:13
"'When he that hath an issue is cleansed of his issue, let him number seven days after he is clean, and wash his clothes, and bathe his flesh in running water, and then he is clean.
Numbers 19:19
And the clean person shall sprinkle upon the unclean the third day and the seventh day. And the seventh day he shall purify himself and wash his clothes and bathe himself in water, and shall be clean at evening.