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.
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.
BBE - And some of those who are wise will have wisdom in testing themselves and making themselves clean, till the time of the end: for it is still for the fixed time.
WEB - Some of those who 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.
YLT - And some of the teachers do stumble for refining by them, and for purifying, and for making white -- till the end of the time, for `it is' yet for a time appointed.