And he shall purify the sons of Levi— Not all of them; for the similitude is taken from gold and silver; which being purified, there remains some dross behind. So it happened after the ministration of the Lord Jesus Christ; a great company of the priests were obedient to the faith, Acts 6:7. Of the other sons of Levi, who did not believe in Christ, but wilfully rejected him, it is just before said, Who may abide the day of his coming, when, the metal being purified, he will cast the dross into the fire. See Houbigant.
Related Commentaries of Malachi 3:3
Malachi 3:3
3 And he shall sit as a refiner and purifier of silver: and he shall purify the sons of Levi, and purge them as gold and silver, that they may offer unto the LORD an offering in righteousness.