'Dust' in the Bible

Then the iron and the earth, the brass and the silver and the gold, were smashed together, and became like the dust on the floors where grain is crushed in summer; and the wind took them away so that no sign of them was to be seen: and the stone which gave the image a blow became a great mountain, covering all the earth.

And turning my face to the Lord God, I gave myself up to prayer, requesting his grace, going without food, in haircloth and dust.

And a number of those who are sleeping in the dust of the earth will come out of their sleep, some to eternal life and some to eternal shame.