Malachi 3:1-4
3:1 See, I am sending 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--indeed, he is coming, says the LORD of hosts.

3:2 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;

3:3 he will sit as a refiner and purifier of silver, and he will purify the descendants of Levi and refine them like gold and silver, until they present offerings to the LORD in righteousness.

3:4 Then the offering of Judah and Jerusalem will be pleasing to the LORD as in the days of old and as in former years.