2 Samuel 15:27-30

The king said also unto Zadok the priest, Art not thou a seer? return into the city in peace, and your two sons with you, Ahimaaz thy son, and Jonathan the son of Abiathar. See, I will tarry in the plain of the wilderness, until there come word from you to certify me. Zadok therefore and Abiathar carried the ark of God again to Jerusalem: and they tarried there. 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.