Malachi 3:1-5

1 "Behold, I send my messenger, and he will prepare the way before me; and the Lord, whom you seek, will suddenly come to his temple; and the messenger of the covenant, whom you desire, behold, he comes!" says Yahweh of hosts.  2 "But who can endure the day of his coming? And who will stand when he appears? For he is like a refiner's fire, and like launderer's soap;  3 and he will sit as a refiner and purifier of silver, and he will purify the sons of Levi, and refine them as gold and silver; and they shall offer to Yahweh offerings in righteousness.  4 Then the offering of Judah and Jerusalem will be pleasant to Yahweh, as in the days of old, and as in ancient years.  5 I will come near to you to judgment; and I will be a swift witness against the sorcerers, and against the adulterers, and against the perjurers, and against those who oppress the hireling in his wages, the widow, and the fatherless, and who deprive the foreigner of justice, and don't fear me," says Yahweh of Hosts.