Leviticus 15:16-18

“ ‘If semen goes out from a man, he must bathe in water; he will be unclean until evening. If the fluid gets on any clothing or leather, it must be washed with water; it will be unclean until evening. “ ‘If a man has sexual relations with a woman and semen comes out, both people must bathe in water; they will be unclean until evening.