Leviticus 15:16

And the man whose seed of copulation shall happen to go forth from him, shall then wash his whole body, and shall be unclean until evening.

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.

“‘If any man has an emission of semen, then he shall bathe all his flesh in water, and be unclean until the evening.