All who have this hope in him purify themselves, just as he is pure.
NMVAnd every man that has this hope in him purifies himself, even as he is pure.
OJBAnd everyone having this tikvah (hope) in Him keeps himself in tohorah (purification, keeps himself pure), even as that One is tahor.
TCENTEveryone who places this hope in him purifies himself, just as he is pure.
T4TSo, all those who confidently expect to see Christ as he actually is/what Christ is like when he returns must keep themselves pure in every way, just like Christ, who is pure in every way.