Luke 9:28-31

And it came to pass about eight days after these sayings, that he took with him Peter and John and James, and went up into the mountain to pray. And as he was praying, the fashion of his countenance was altered, and his raiment became white and dazzling. And behold, there talked with him two men, who were Moses and Elijah; who appeared in glory, and spake of his decease which he was about to accomplish at Jerusalem.