Luke 9:29

και εγενετο εν τω προσευχεσθαι αυτον το ειδος του προσωπου αυτου ετερον και ο ιματισμος αυτου λευκος εξαστραπτων

kai egeneto en tō proseychesthai ayton to eidos toy prosōpoy aytoy eteron kai o imatismos aytoy leykos exastraptōn

King James Version (KJV)

And as he prayed, the fashion of his countenance was altered, and his raiment {was} white {and} glistering.

Modern English

As he was praying, the appearance of his face was altered, and his clothing became white and dazzling.