Luke 9:24-31

For whoever wishes to save his life [in this world] will [eventually] lose it [through death], but whoever loses his life [in this world] for My sake, he is the one who will save it [from the consequences of sin and separation from God]. For what does it profit a man if he gains the whole world [wealth, fame, success],and loses or forfeits himself? For whoever is ashamed [here and now] of Me and My words, the Son of Man will be ashamed of him when He comes in His glory and the glory of the [heavenly] Father and of the holy angels. But I tell you truthfully, there are some among those standing here who will not taste death before they see the kingdom of God.” Now about eight days after these teachings, He took along Peter and John and James and went up on the mountain to pray. [Matt 17:1-8; Mark 9:2-8] As He was praying, the appearance of His face became different [actually transformed], and His clothing became white and flashing with the brilliance of lightning. And behold, two men were talking with Him; and they were Moses and Elijah, who appeared in glory, and were speaking of His departure [from earthly life], which He was about to bring to fulfillment at Jerusalem.