Matthew 17:3

Moses and Elijah. Both were special in Jewish thinking. Elijah had not died at all (2 Kings 2:11), being taken directly in a "chariot of fire." Moses, who at the moment of death, was snatched bodily from the Devil's power (Jude 1:9; Deuteronomy 34:6). Both come from the world of the dead [Hades] to be with Jesus in this Transfiguration. Moses was the representative of the Law; Elijah of the Prophets (compare Matthew 7:12). Talking with Jesus. About how he would soon fulfill God's purpose by dying in Jerusalem (Luke 9:31). God chose to make this historical act of Jesus' death the "focal point" of his saving grace. Compare Hebrews 9:15; Colossians 1:20.