Leviticus 15:17
And every garment, and every skin, whereon is the seed of copulation, shall be washed with water, and be unclean until the even.
Cross-reference
Deuteronomy 23:11
Parallel
Deuteronomy 23:11 instructs the man to bathe at evening, while Leviticus 15:17 addresses washing the garment — parallel laws on same uncleanness.