'Dust' in the Bible

And in the hearing of his countrymen and the army of Samaria he said, What are these feeble Jews doing? will they make themselves strong? will they make offerings? will they get the work done in a day? will they make the stones which have been burned come again out of the dust?

Now on the twenty-fourth day of this month the children of Israel came together, taking no food and putting haircloth and dust on their bodies.