'Sackcloth' in the Bible

'Woe to thee, Chorazin! woe to thee, Bethsaida! because, if in Tyre and Sidon had been done the mighty works that were done in you, long ago in sackcloth and ashes they had reformed;

'Woe to thee, Chorazin; woe to thee, Bethsaida; for if in Tyre and Sidon had been done the mighty works that were done in you, long ago, sitting in sackcloth and ashes, they had reformed;

And I saw when he opened the sixth seal, and lo, a great earthquake came, and the sun became black as sackcloth of hair, and the moon became as blood,

and I will give to My two witnesses, and they shall prophesy days, a thousand, two hundred, sixty, arrayed with sackcloth;