The Transfiguration of Jesus is an event reported by the Synoptic Gospels in which Jesus is transfigured upon a mountain (Matthew 17:1-9, Mark 9:2-8, Luke 9:28-36.) Jesus becomes radiant, speaks with Moses and Elijah, and is called "Son" by God. Peter, James and John were with Jesus upon the mountain. The transfiguration put Jesus above Moses and Elijah, the two preeminent figures of Judaism. It also supports his identity as the Son of God. In keeping with the Messianic secret, Jesus tells the witnesses (Peter, James, son of Zebedee and John the Apostle) not to tell others what they saw until He has risen on the third day after his death on the cross.
The principal account is that in the Synoptic Gospels; 2 Peter and the Gospel of John may also briefly allude to the event (2 Peter 1:16-18, John 1:14). Peter describes himself as an eyewitness "of his sovereign majesty." None of the accounts identifies the "high mountain" of the scene by name. The earliest identification of the mountain as Mount Tabor is in the 5th century Transitus Beatae Mariae Virginis. RT France notes that Mount Hermon is closest to Caesarea Philippi, mentioned in the previous chapter of Matthew.
Image (Raphael) & Text:wikipedia.com