Leviticus 15:18–28

When a man sleeps with a woman and has an emission of semen, both are to wash in water; they remain unclean until evening.

^19–23“When a woman has a discharge of blood, the impurity of her menstrual period lasts seven days. Anyone who touches her is unclean until evening. Everything on which she lies or sits during her period is unclean. Anyone who touches her bed or anything on which she sits must wash his clothes and bathe in water; he remains unclean until evening.

²⁴“If a man sleeps with her and her menstrual blood gets on him, he is unclean for seven days and every bed on which he lies becomes unclean.

^25–27“If a woman has a discharge of blood for many days, but not at the time of her monthly period, or has a discharge that continues beyond the time of her period, she is unclean the same as during the time of her period. Every bed on which she lies during the time of the discharge and everything on which she sits becomes unclean the same as in her monthly period. Anyone who touches these things becomes unclean and must wash his clothes and bathe in water; he remains unclean until evening.

^28–30“When she is cleansed from her discharge, she is to count off seven days; then she is clean.