'Ashes' in the Bible

Yahweh said to Moses and to Aaron, "Take to you handfuls of ashes of the furnace, and let Moses sprinkle it toward the sky in the sight of Pharaoh.

They took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it up toward the sky; and it became a boil breaking forth with boils on man and on animal.

You shall make its pots to take away its ashes, its shovels, its basins, its flesh hooks, and its fire pans: all its vessels you shall make of brass.