Leviticus 15:16-18

15:16 “‘When a man has a seminal emission, he must bathe his whole body in water and be unclean until evening, 15:17 and he must wash in water any clothing or leather that has semen on it, and it will be unclean until evening. 15:18 When a man has sexual intercourse with a woman and there is a seminal emission, they must bathe in water and be unclean until evening.