Mark 9:9-13

As they all hiked down the mountain together, Jesus ordered them, “Don’t tell anyone of what you just witnessed. Wait until the Son of Man is raised from the dead.” So they kept it to themselves, puzzled over what Jesus meant about rising from the dead. Then they asked him, “Why do the religious scholars insist that Elijah must come before the Messiah?” He answered them, “They’re right. Elijah must come first to put everything in order. And what about all that is written about the Son of Man? It is true that he must endure many sufferings and be rejected. So Elijah has already appeared, just as it was prophesied, and they did to him whatever they pleased.”