'Sackcloth' in the Bible

Because of this, put on sackcloth;mourn and wail,for the Lord’s burning angerhas not turned away from us.

My dear people, dress yourselves in sackclothand roll in the dust.Mourn as you would for an only son,a bitter lament,for suddenly the destroyer will come on us.

Indeed, every head is bald and every beard clipped; on every hand is a gash and sackcloth around the waist.

Wail, Heshbon, for Ai is devastated;cry out, daughters of Rabbah!Clothe yourselves with sackcloth, and lament;run back and forth within your walls,because Milcom will go into exiletogether with his priests and officials.