2 Samuel 15:28-30

   28: See, I will tarry in the plain of the wilderness, until there come word from you to certify me.
   29: Zadok therefore and Abiathar carried the ark of God again to Jerusalem: and they tarried there.
   30: And David went up by the ascent of mount Olivet, and wept as he went up, and had his head covered, and he went barefoot: and all the people that was with him covered every man his head, and they went up, weeping as they went up.