'Sackcloth' in the Bible

“For this, put on sackcloth,Lament and wail;For the fierce anger of the LordHas not turned back from us.”

O daughter of my people, put on sackclothAnd roll in ashes;Mourn as for an only son,A lamentation most bitter.For suddenly the destroyerWill come upon us.

For every head is bald and every beard cut short; there are gashes on all the hands and sackcloth on the loins.

“Wail, O Heshbon, for Ai has been destroyed!Cry out, O daughters of Rabbah,Gird yourselves with sackcloth and lament,And rush back and forth inside the walls;For Malcam will go into exileTogether with his priests and his princes.