2 Samuel 16:21 MSG

[21] Ahithophel told Absalom, “Go and sleep with your father’s concubines, the ones he left to tend to the palace. Everyone will hear that you have openly disgraced your father, and the morale of everyone on your side will be strengthened.” So Absalom pitched a tent up on the roof in public view, and went in and slept with his father’s concubines.