'Dust' in the Bible

Declare ye it not at Gath, weep ye not at all: in the house of Aphrah roll thyself in the dust.

And my hater will see it and be covered with shame; she who said to me, Where is the Lord your God? my eyes will see their desire effected on her, now she will be crushed under foot like the dust of the streets.

They shall lick the dust like a serpent, they shall move out of their holes like worms of the earth: they shall be afraid of the LORD our God, and shall fear because of thee.