'Refine' in the Bible

“Surely there is a mine for silver,And a place where they refine gold.

Some of those who are [spiritually] wise and have insight will fall [as martyrs] in order to refine, to purge and to make those among God’s people pure, until the end time; because it is yet to come at the time appointed [by God].

“And I will bring the third part through the fire,Refine them as silver is refined,And test them as gold is tested.They will call on My name,And I will listen and answer them;I will say, ‘They are My people,’And they will say, ‘The Lord is my God.’”

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