Malachi 3:2-4

But who can endure the day of his coming, and who can stand when he appears? For he is like a refiner’s fire and like fullers’ soap. He will sit as a refiner and purifier of silver, and he will purify the sons of Levi and refine them like gold and silver, and they will bring offerings in righteousness to the LORD. Then the offering of Judah and Jerusalem will be pleasing to the LORD as in the days of old and as in former years.