'Refine' in the Bible

Therefore, this is what the Lord of Hosts says:I am about to refine them and test them,for what else can I dobecause of My dear people?

I will put this third through the fire;I will refine them as silver is refinedand test them as gold is tested.They will call on My name,and I will answer them.I will say: They are My people,and they will say: Yahweh is our God.”

He will be like a refiner and purifier of silver; He will purify the sons of Levi and refine them like gold and silver. Then they will present offerings to the Lord in righteousness.