'White' in the Bible

I beheld till thrones were placed, and one that was ancient of days did sit: his raiment was white as snow, and the hair of his head like pure wool; his throne was fiery flames, and the wheels thereof burning fire.

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.

Many shall purify themselves, and make themselves white, and be refined; but the wicked shall do wickedly; and none of the wicked shall understand; but they that are wise shall understand.