Purification for Women: After Menstruation
Source: Nav
Leviticus 15:19–33
When a woman has a discharge consisting of blood from her body, she will be unclean due to her menstruation for seven days, and anyone who touches her will be unclean until evening. / Anything on which she lies or sits during her menstruation will be unclean, / and anyone who touches her bed must wash his clothes and bathe with water, and he will be unclean until evening.
2 Samuel 11:4
Then David sent messengers to get her, and when she came to him, he slept with her. (Now she had just purified herself from her uncleanness.) Then she returned home.