Malachi 3:1-4

Now I am sending my messenger— he will prepare the way before me; And the lord whom you seek will come suddenly to his temple; The messenger of the covenant whom you desire— see, he is coming! says the LORD of hosts. But who can endure the day of his coming? Who can stand firm when he appears? For he will be like a refiner’s fire, like fullers’ lye. He will sit refining and purifying silver, and he will purify the Levites, Refining them like gold or silver, that they may bring offerings to the LORD in righteousness. Then the offering of Judah and Jerusalem will please the LORD, as in ancient days, as in years gone by.