Malachi 3:3

and He shall sit as a refiner and purifier of silver, the entire Messianic period being a time of testing and of judgment, John 9:39, culminating in the day of the final Judgment; and He shall purify the sons of Levi, for the judgment begins at the house of God, and purge them as gold and silver that they may offer unto the Lord an offering in righteousness, so that all the members of the New Testament priesthood, in fact, might serve Him in holiness and righteousness.