2 Samuel 16:20-23

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

21So Ahithophel said to Absalom, “Go to your father’s concubines whom he has left to take care of the palace. Then all Israel will hear that you have made yourself abhorrent to your father and the hands of all who are with you will also be strengthened.”

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

23Now in those days the counsel that Ahithophel gave was like inquiring for the word of God—so was all of Ahithophel’s counsel both with David and with Absalom.