Leviticus 15:16
"And if any man’s seed of copulation go out from him, then he shall wash all his flesh in water, and be unclean until the even."
Cross References (ranked by relevance)
Leviticus 22:4
What man soever of the seed of Aaron is a leper, or hath a running issue; he shall not eat of the holy things, until he be clean. And whoso toucheth any thing that is unclean by the dead, or a man whose seed goeth from him;
Leviticus 15:5
And whosoever toucheth his bed shall wash his clothes, and bathe himself in water, and be unclean until the even.