Strong H6884 צָרַף tsâraph · to refine

Malachi

1. Malachi 3:2
   But who may abide the day of his coming? and who shall stand when he appeareth? for he is like a refiner’s fire, and like fullers’ soap:
2. Malachi 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.