'Covered' in the Bible

But David went up by the ascent of the Olives, 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.

And the king covered his face, and the king cried with a loud voice, My son Absalom! Absalom, my son, my son!