2 Samuel 16:20-23

Then Absalom said to Ahithophel, “Give your counsel. What shall we do?” Ahithophel said to Absalom, “Go in to your father’s concubines, whom he has left to keep the house, and all Israel will hear that you have made yourself a stench to your father, and the hands of all who are with you will be strengthened.” So they pitched a tent for Absalom on the roof. And Absalom went in to his father’s concubines in the sight of all Israel. Now in those days the counsel that Ahithophel gave was as if one consulted the word of God; so was all the counsel of Ahithophel esteemed, both by David and by Absalom.