for they [are] your people and your inheritance whom you brought from Egypt from the middle of the smelter of iron.

Iron is taken out of the earth, and copper is smelted out of the ore.

A crucible for silver, and a smelter for gold,
and the Lord is the tester of hearts.

A crucible for silver, and a smelter for gold,
and a man for the words of his praise.

To an idol?—something that a smelter casts,
and a metalworker plates with gold
and makes silver welds for it?

So the craftsman encourages the smelter,
And he who smooths metal with the hammer encourages him who beats the anvil,
Saying of the soldering, “It is good”;
And he fastens it with nails,
So that it will not totter.

The bellows blow fiercely, the lead is consumed by the fire; the smelter refines in vain: for the wicked are not removed.

just like a smelter gathers all the silver, bronze, lead, and tin to the center of a furnace and injects fire in order to melt it, I'm going to gather you in my anger and rage, make you settle down and then I'm going to melt you down.

Many will be purged, purified (made white) and refined, but the wicked will behave wickedly. None of the wicked shall understand, but those who are [spiritually] wise will understand.

He will sit as a smelter and purifier of silver, and He will purify the sons of Levi and refine them like gold and silver, so that they may present to the Lord offerings in righteousness.