Leviticus 15:18-20

Living Bible

¹⁸ After sexual intercourse, the woman as well as the man must bathe, and they are ceremonially defiled until the next evening.

¹⁹ “Whenever a woman menstruates, she shall be in a state of ceremonial defilement for seven days afterwards, and during that time anyone touching her shall be defiled until evening. ²⁰ Anything she lies on or sits on during that time shall be defiled.