Leviticus 15:17-19

New Revised Standard Version Catholic Edition

¹⁷ Everything made of cloth or of skin on which the semen falls shall be washed with water, and be unclean until the evening. ¹⁸ If a man lies with a woman and has an emission of semen, both of them shall bathe in water, and be unclean until the evening.

¹⁹ When a woman has a discharge of blood that is her regular discharge from her body, she shall be in her impurity for seven days, and whoever touches her shall be unclean until the evening.