Luke 9:26-29

26For whoever is ashamed of me and my words, the Son of Man will be ashamed of that person when he comes in his glory and in the glory of the Father and of the holy angels.

27But I tell you most certainly, there are some standing here who will not experience death before they see the kingdom of God.”

28Now about eight days after these sayings, Jesus took with him Peter, John, and James, and went up the mountain to pray.

29As he was praying, the appearance of his face was transformed, and his clothes became very bright, a brilliant white.