Malachi 3:1-4

“Behold, I am going to send My messenger, and he will prepare and clear the way before Me. And the Lord [the Messiah], whom you seek, will suddenly come to His temple; the Messenger of the covenant, in whom you delight, behold, He is coming,” says the LORD of hosts. [Matt 11:10; Luke 1:13-17, 76] “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.