'Dust' in the Bible

O daughter of my people, put on haircloth, rolling yourself in the dust: give yourself to sorrow, as for an only son, with most bitter cries of grief; for he who makes waste will come on us suddenly.

Give cries of grief, you keepers of sheep; give cries for help, rolling yourselves in the dust, you chiefs of the flock: for the days of your destruction have fully come, and I will send you in all directions, and your fall will be like that of the males of the flock.