2 Samuel 16:20-22

Then Absalom said to Ahithophel, “Give your advice. What shall we do?” Ahithophel said to Absalom, “Go in to your father’s concubines, whom he has left to keep the house; then all Israel will hear that you have made yourself odious to your father. The hands of all who are with you will also be strengthened.” So they pitched a tent for Absalom on the roof, and Absalom went in to his father’s concubines in the sight of all Israel.