Leviticus 15:19

“Speak to the sons of Israel, saying: ‘When a woman gives birth and bears a male child, then she shall be unclean for seven days, as in the days of her menstruation she shall be unclean.

Then David sent messengers and took her, and she came to him, and he lay with her; and when she had purified herself from her uncleanness, she returned to her house.

“Son of man, when the house of Israel was living in their own land, they defiled it by their ways and their deeds; their way before Me was like the uncleanness of a woman in her impurity.