24 And on the seventh day you must wash your clothes, and you shall be clean; and after that you may come into the camp.
Numbers 31:24 Cross References - Thomson
Leviticus 11:25
25 And whoever carrieth any of their carcases shall wash his clothes, and be unclean until evening.
Leviticus 14:9
9 And on the seventh day he shall shave off all the hair on his head, and beard, and his eye brows; and having shaved off all his hair, he shall wash his clothes, and wash his body with water, and he shall be clean.
Leviticus 15:13
13 And when he is clean of his disorder, he shall reckon for himself seven days for his purification, and he shall wash his clothes, and wash his body with water, and he shall be clean.
Numbers 19:19
19 The clean person shall sprinkle it on the unclean, on the third day, and on the seventh day. And on the seventh day he shall purify himself^ and shall wash his clothes, and wash himself with water, and be unclean until evening.