Leviticus 15:16 in the King James Version
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.
Context
15 The priest shall offer them, the one for a sin offering, and the other for a burnt offering. The priest shall make atonement for him before the LORD for his discharge.
16 “‘If any man has an emission of semen, then he shall bathe all his flesh in water, and be unclean until the evening.
17 Every garment and every skin which the semen is on shall be washed with water, and be unclean until the evening.