His head covered - See the marginal references and Jeremiah 14:3-4; Ezekiel 24:17; the sign of deep mourning.
Related Commentaries of 2 Samuel 15:30
2 Samuel 15:30
30 And David went up by the ascent of mount Olivet, and weptf 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.