What does it mean that Moses and Elijah appeared with Jesus?

The appearance of Moses and Elijah during the transfiguration signifies their roles as representatives of the law and the prophets, respectively. This indicates that all that was written in the Old Testament anticipates and finds its fulfillment in Jesus. Their presence affirms that Jesus is not just another prophet but the embodiment of God's ultimate revelation. As the Old Testament is fulfilled in Christ, He surpasses them both in glory. This moment also underscores that the teachings of the Old Testament point towards the redemptive work of Christ, reinforcing the unity of the Scriptures.