2 Samuel 16:15-22

15Now when Absalom and all the men of Israel arrived in Jerusalem, Ahithophel was with him.

16When David’s friend Hushai the Arkite came to Absalom, Hushai said to him, “Long live the king! Long live the king!”

17Absalom said to Hushai, “Do you call this loyalty to your friend? Why didn’t you go with your friend?”

18Hushai replied to Absalom, “No, I will be loyal to the one whom the Lord, these people, and all the men of Israel have chosen.

19Moreover, whom should I serve? Should it not be his son? Just as I served your father, so I will serve you.”

20Then Absalom said to Ahithophel, “Give us your advice. What should we do?”

21Ahithophel replied to Absalom, “Have sex with your father’s concubines whom he left to care for the palace. All Israel will hear that you have made yourself repulsive to your father. Then your followers will be motivated to support you.”

22So they pitched a tent for Absalom on the roof, and Absalom had sex with his father’s concubines in the sight of all Israel.