2 Samuel 15:30-31

15:30 As David was going up the Mount of Olives, he was weeping as he went; his head was covered and his feet were bare. All the people who were with him also had their heads covered and were weeping as they went up. 15:31 Now David had been told, “Ahithophel has sided with the conspirators who are with Absalom. So David prayed, “Make the advice of Ahithophel foolish, O Lord!”