Question: what is the significance of sackcloth in the bible?
Answer: Sackcloth came to mean a garment, too, made from such cloth, which was worn as a token of mourning by the Israelites. It was also a sign of submission (1 Kings 20:31-32), or of grief and self-humiliation (2 Kings 19:1), and was occasionally worn by the Prophets. It is often associated with ashes.