20Then Absalom said to Ahithophel, “Give me counsel. What should we do?”
21Ahithophel replied, “Sleep with your father’s concubines, whom he has left to keep the palace. When all Israel hears that you have become a stench to your father, then the hands of all who are with you will be strengthened.”
22So they pitched a tent for Absalom on the roof, and he slept with his father’s concubines in the sight of all Israel.
23Now in those days the advice of Ahithophel was like the consultation of the word of God. Such was the regard that both David and Absalom had for Ahithophel’s advice.
— 2 Samuel 16:20-23