Leviticus 15:31-33

31“You must separate the Israelites from anything that keeps them from being presentable to me. Otherwise, they will die because they make my tent, which is among them, unclean.

32“These are the instructions for any man who has a discharge or an emission of semen that makes him unclean,

33for any woman who has her period, for any man or woman who has a discharge, or for any man who has sexual intercourse with a woman when she is unclean.”