'Clothed in White' in the Bible

He who overcomes shall be clothed in white garments, and I will not blot out his name from the Book of Life; but I will confess his name before my Father and before his angels.

Round the throne were twenty-four thrones, and seated on the thrones were twenty-four elders, clothed in white garments, and golden crowns on their heads.

After this I looked, and behold, a great multitude which no one could count, from every nation and all tribes and peoples and tongues, standing before the throne and before the Lamb, clothed in white robes, and palm branches were in their hands;

Then one of the elders addressed me, saying, "Who are these, clothed in white robes, and where have they come from?"