2Sam 16:21-22

21Ahithophel said to Absalom, “Go in to your father's concubines, the ones he has left to look after the house; and all Israel will hear that you have made yourself odious to your father, and the hands of all who are with you will be strengthened.”22So they pitched a tent for Absalom upon the roof; and Absalom went in to his father's concubines in the sight of all Israel.