Leviticus 15:16-18

‘If any man has an emission of semen, then he shall wash all his body in water, and be unclean until evening. And any garment and any leather on which there is semen, it shall be washed with water, and be unclean until evening. Also, when a woman lies with a man, and there is an emission of semen, they shall bathe in water, and be unclean until evening.