'Sackcloth' in the Bible

For this, gird on sackcloth, lament and howl, For the fierce anger of Jehovah hath not turned back from us.

O daughter of My people, Gird on sackcloth, and roll thyself in ashes, The mourning of an only one make for thee, A lamentation most bitter, For suddenly come doth the spoiler against us.

For every head is bald, and every beard diminished, On all hands cuttings, and on the loins -- sackcloth.

Howl, Heshbon, for spoiled is Ai, Cry, daughters of Rabbah, gird on sackcloth, Lament, and go to and fro by the hedges, For Malcam into captivity doth go, His priests and his princes together.