'Refine' in the Bible

"Surely there is a mine for silver, and a place for gold which they refine.

Some of those who are wise shall fall, to refine them, and to purify, and to make them white, even to the time of the end; because it is yet for the time appointed.

I will bring the third part into the fire, and will refine them as silver is refined, and will test them like gold is tested. They will call on my name, and I will hear them. I will say, 'It is my people;' and they will say, 'Yahweh is my God.'"

and he will sit as a refiner and purifier of silver, and he will purify the sons of Levi, and refine them as gold and silver; and they shall offer to Yahweh offerings in righteousness.