The disciples of Jesus had been with Him for some time as He went throughout Galilee preaching. All this time, the disciples saw the human nature of Christ and His power to heal people of their diseases, to drive out demons and to perform miracles. However, it was in His Transfiguration that Jesus revealed His glory to three of His disciples.
Luke’s Gospel tells us that Jesus appeared in glory as He was conversing with Moses and Elijah about His “exodus” that He was going to accomplish in Jerusalem. That “exodus” is His suffering, death and resurrection. Moses and Elijah represent the Law and the prophets. In ancient Israel, the Law established the terms of the covenant between God and Israel, stating Israel’s obligations and responsibilities. On the other hand, the prophets were God’s messengers, and they enforced the Law by reminding Israel of their covenant obligations and warning them of the consequences of disobedience.
The fact that a voice from the cloud said, “This is my chosen Son; listen to Him,” (Luke 9:35) and then Moses and Elijah disappeared, confirmed that Jesus came to fulfill the Law and the prophets, just as He would later say, “Do not think that I have come to abolish the law or the prophets. I have come not to abolish but to fulfill.” (Matthew 5:17) Jesus fulfilled the Law and the prophets by teaching its true meaning, inaugurating the Kingdom of God and offering a new and only path to God through His suffering, death and resurrection.