II Samuel 16:21-22

And Ahithophel said to Absalom, “Go in to your father’s concubines, whom he has left to keep the house; and all Israel will hear that you are abhorred by your father. Then the hands of all who are with you will be strong.” So they pitched a tent for Absalom on the top of the house, and Absalom went in to his father’s concubines in the sight of all Israel.