Leviticus 15:31-33

New Revised Standard Version, Anglicised Catholic Edition

³¹ Thus you shall keep the people of Israel separate from their uncleanness, so that they do not die in their uncleanness by defiling my tabernacle that is in their midst.

³² This is the ritual for those who have a discharge: for him who has an emission of semen, becoming unclean thereby, ³³ for her who is in the infirmity of her period, for anyone, male or female, who has a discharge, and for the man who lies with a woman who is unclean.