'Sackcloth' in the Bible

For this gird you with sackcloth, lament and wail; for the fierce anger of Jehovah is not turned back from us.

O daughter of my people, gird thee with sackcloth, and wallow thyself in ashes: make thee mourning, as for an only son, most bitter lamentation; for the destroyer shall suddenly come upon us.

For every head is bald, and every beard clipped: upon all the hands are cuttings, and upon the loins sackcloth.

Wail, O Heshbon, for Ai is laid waste; cry, ye daughters of Rabbah, gird you with sackcloth: lament, and run to and fro among the fences; for Malcam shall go into captivity, his priests and his princes together.