NET
35 Even some of the wise will stumble, resulting in their refinement, purification, and cleansing until the time of the end, for it is still for the appointed time.
Darby
35 And [some] of the wise shall fall, to try them, and to purge and to make them white, to the time of the end: for it shall yet be for the time appointed.
KJV
35 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.