Numbers 31:24
And you will wash your garments on the seventh day and be clean, and afterward you will come into the camp."
Leviticus 11:25
and anyone who carries their dead body must wash his garments, and he shall be unclean until the evening.
Leviticus 14:9
{And then} on the seventh day he must shave off all his hair--he must shave his head and his beard and {his eyebrows} and all [the rest] of his hair--and he shall wash his garments, and he shall wash his body in the water; thus he shall be clean.
Leviticus 15:13
" 'And when the person who discharges becomes clean from his body fluid discharge, he shall count for himself seven days for his cleansing; then he shall wash his garments, and he shall wash his body with {fresh} water, and he shall be clean.
Numbers 19:19
The clean [person] will spatter the unclean on the third day and on the seventh day; and on the seventh day he will purify him, and he will wash his garments; he will bathe in the waters, and in the evening he will be clean.