American Standard Version (ASV):
And some of them that are wise shall fall, to refine them, and to purify, and to make them white, even to the time of the end; because it is yet for the time appointed.
King James Version (KJV):
And [some] of them of understanding shall fall, to try them, and to purge, and to make [them] white, [even] to the time of the end: because [it is] yet for a time appointed.