Leviticus 15:16-15:28

When a man has an emission of semen, he shall bathe his whole body in water and remain unclean until evening. All cloth or leather on which semen falls shall be washed in water and remain unclean until evening. And if a man has carnal relations with a woman, they shall bathe in water and remain unclean until evening. When a woman has a discharge, her discharge being blood from her body, she shall remain in her impurity seven days; whoever touches her shall be unclean until evening. Anything that she lies on during her impurity shall be unclean; and anything that she sits on shall be unclean. Anyone who touches her bedding shall wash his clothes, bathe in water, and remain unclean until evening; and anyone who touches any object on which she has sat shall wash his clothes, bathe in water, and remain unclean until evening. Be it the bedding or be it the object on which she has sat, on touching it he shall be unclean until evening. And if a man lies with her, her impurity is communicated to him; he shall be unclean seven days, and any bedding on which he lies shall become unclean. When a woman has had a discharge of blood for many days, not at the time of her impurity, or when she has a discharge beyond her period of impurity, she shall be unclean, as though at the time of her impurity, as long as her discharge lasts. Any bedding on which she lies while her discharge lasts shall be for her like bedding during her impurity; and any object on which she sits shall become unclean, as it does during her impurity: whoever touches them shall be unclean; he shall wash his clothes, bathe in water, and remain unclean until evening. When she becomes clean of her discharge, she shall count off seven days, and after that she shall be clean.