2 Samuel 16:18-23

16:18 Hushai replied to Absalom, “No, I will be loyal to the one whom the Lord, these people, and all the men of Israel have chosen. 16:19 Moreover, whom should I serve? Should it not be his son? Just as I served your father, so I will serve you.”

16:20 Then Absalom said to Ahithophel, “Give us your advice. What should we do?” 16:21 Ahithophel 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.” 16:22 So they pitched a tent for Absalom on the roof, and Absalom had sex with his father’s concubines in the sight of all Israel.

16:23 In those days Ahithophel’s advice was considered as valuable as a prophetic revelation. Both David and Absalom highly regarded the advice of Ahithophel.