'Refine' in the Bible

Therefore, thus says Yahweh of hosts: "Look, I [am] about to refine them, and I will test them, for what else can I do, because of the {presence} of the daughter of my people?

And I will bring the [remaining] third into the fire, and I will refine them like [one] refines silver, and I will test them like [one] tests gold. They will call my name, and I will answer them. I will say, 'They are my people,' and they will say, 'Yahweh [is] my God.'"

He will sit [as] a refiner and purifier of silver; he will purify the children of Levi, and he will refine them like gold and like silver, and they will present to Yahweh offerings in righteousness.