2 Samuel 15:30-31

30And David went up the ascent of the Mount of Olives, weeping as he went, with his head covered and walking barefoot [in despair]. And all the people who were with him covered their heads and went up, weeping as they went.

31David was told, “Ahithophel [your counselor] is among the conspirators with Absalom.” David said, “O Lord, I pray You, turn Ahithophel’s counsel into foolishness.”