Luke 9:28-32

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. Now Peter and those who were with him had been overcome with sleep; but when they were fully awake, they saw His glory and splendor and majesty, and the two men who were standing with Him.