2 Samuel 16:15-23 - Hushai Comes To Absalom
15 Right about then, Absalom and his entourage from the people of Israel entered Jerusalem, accompanied by Ahithophel. 16 When David's friend Hushai the Archite approached Absalom, Hushai greeted Absalom, "Long live the king! Long live the king!"
17 But Absalom asked Hushai, "So this is how you demonstrate your loyalty to your closest friends? Why didn't you leave with your friend?"
18 Hushai replied, "No! On the contrary, whomever the LORD, this group, and all the men of Israel choose is where I'll be, and I'll remain with him! 19 Besides, who else should I be serving? Why not the son? The same way I served your father, I'll serve you."
20 So Absalom asked Ahithophel, "What's your advice? What should we do?"
21 Ahithophel responded, "Go inside and have sex with your father's mistresses, whom he left to keep the palace in order. Then everyone in Israel will hear how your father has come to hate you and everyone who has joined you will be emboldened to act." 22 So they erected a tent for Absalom on the palace roof and Absalom went in and had sex with his father's mistresses right in front of all Israel.