2 Samuel 15:27-30

The king also said to Zadok the priest, “Are you not a seer? Go back to the city in peace, with your two sons, Ahimaaz your son, and Jonathan the son of Abiathar. See, I will wait at the fords of the wilderness until word comes from you to inform me.” So Zadok and Abiathar carried the ark of God back to Jerusalem, and they remained there. But David went up the ascent of the Mount of Olives, weeping as he went, barefoot and with his head covered. And all the people who were with him covered their heads, and they went up, weeping as they went.