καὶ ἰδοὺ ἄνδρες δύο συνελάλουν αὐτῷ, οἵτινες ἦσαν Μωϋσῆς καὶ Ἡλείας,
Luke said that suddenly, the 3 apostles saw 2 men (καὶ ἰδοὺ ἄνδρες), Moses (οἵτινες ἦσαν Μωϋσῆς) and Elijah (καὶ Ἡλείας), talking to Jesus (συνελάλουν αὐτῷ). This appearance of Moses and Elijah can be found in all 3 synoptic gospels, Matthew, chapter 17:34, Mark, chapter 9:4, and here in Luke. Mark said that Elijah with Moses, talking with Jesus, appeared to the 3 disciples. Matthew also said that suddenly Moses and Elijah were talking with Jesus in front of the 3 apostles. How did they know what Moses and Elijah looked like? They had never seen them before. They were nearly 1,000 years removed from their existence. Jesus, however, recognized and talked with them, so that is why they might have realized who they were. Thus, Jesus was the fulfillment of the Law of Moses and at the same time the fulfillment of the prophets with Elijah, one of the earliest prophets from the 9th century BCE. Moses and Elijah also represented the ancient righteous people. How would you recognize an ancient historical figure?