Luke 9:26-29

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

27But I tell you truly, there are some standing here who will not taste death until they see the kingdom of God."

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

29And as he was praying, the appearance of his face was altered, and his clothing became dazzling white.