2 Samuel 16:21-22

Ahithophel said, “Your father left behind some of his slave women to take care of the palace. Have sexual relations with them. Then all Israel will hear that your father is your enemy, and all your people will be encouraged to give you more support.” So they put up a tent for Absalom on the roof of the palace where everyone in Israel could see it. And Absalom had sexual relations with his father’s slave women.