'Dross' in the Bible

Remove the dross from the silver, and material for the silversmith will emerge;

The fiery bellows of judgment burn fiercely. But there is too much dross to be removed. The process of refining them has proved useless. The wicked have not been purged.

My message is like a fire that purges dross! It is like a hammer that breaks a rock in pieces! I, the Lord, so affirm it!