Malachi 3:1-4 Revised Standard Version (RSV)
The Coming Messenger
3 “Behold, I send my messenger to prepare the way before me, and the Lord 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. 2 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; 3 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, till they present right offerings to the Lord. 4 Then the offering of Judah and Jerusalem will be pleasing to the Lord as in the days of old and as in former years.