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. 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 (Saint Peter, James, son of Zebedee and John the Apostle) not to tell others what they saw.
Propers for The Transfiguration of Christ
O GOD, who on the mount didst reveal to chosen witnesses thine only-begotten Son wonderfully transfigured, in raiment white and glistering; Mercifully grant that we, being delivered from the disquietude of this world, may be permitted to behold the King in his beauty, who with thee, O Father, and thee, O Holy Ghost, liveth and reigneth, one God, world without end. Amen.
The Epistle - 2 Peter 1:13-18.
I THINK it meet, as long as I am in this tabernacle, to stir you up by putting you in remembrance; knowing that shortly I must put off this my tabernacle, even as our Lord Jesus Christ hath shewed me. Moreover I will endeavour that ye may be able after my decease to have these things always in remembrance. For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty. For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased. And this voice which came from heaven we heard, when we were with him in the holy mount.
The Gospel - St. Luke 9:28-36.
AND it came to pass about an eight days after these sayings, he took Peter and John and James, and went up into a mountain to pray. And as he prayed, the fashion of his countenance was altered, and his raiment was white and glistering. And, behold, there talked with him two men, which were Moses and Elias: who appeared in glory, and spake of his decease which he should accomplish at Jerusalem. But Peter and they that were with him were heavy with sleep: and when they were awake, they saw his glory, and the two men that stood with him. And it came to pass, as they departed from him, Peter said unto Jesus, Master, it is good for us to be here: and let us make three tabernacles; one for thee, and one for Moses, and one for Elias: not knowing what he said. While he thus spake, there came a cloud, and overshadowed them: and they feared as they entered into the cloud. And there came a voice out of the cloud, saying, This is my beloved Son: hear him. And when the voice was past, Jesus was found alone. And they kept it close, and told no man in those days any of those things which they had seen.