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 launderer’s soap [which removes impurities and uncleanness]. [Rev 6:12-17] 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. Then the offering of Judah and Jerusalem will be pleasing to the LORD as in the days of old and as in ancient years.