'Covered' in the Bible

And David went up the ascent of the Mount of Olives, weeping as he went, with his head covered and walking barefoot [in despair]. And all the people who were with him covered their heads and went up, weeping as they went.

But the king covered his face and cried out with a loud voice, “O my son Absalom, O Absalom, my son, my son!”

Then Joab came into the house to the king and said, “Today you have put all your servants to shame who this day have saved your life and the lives of your sons and your daughters, and the lives of your wives and concubines.