'Refiner' in the Bible

I have appointed you to be an assayer among My people—a refiner—so you may know and assay their way of life.

The bellows have been burnt, By fire hath the lead been consumed, In vain hath a refiner refined, And the wicked have not been drawn away.

Spread-out silver from Tarshish is brought, And gold from Uphaz, Work of an artisan, and of the hands of a refiner, Blue and purple is their clothing, Work of the skilful -- all of them.

Brutish is every man by knowledge, Put to shame is every refiner by a graven image, For false is his molten image. And there is no breath in them.

Brutish hath been every man by knowledge, Put to shame hath been every refiner by a graven image, For false is his molten image, And there is no breath in them.