Mark 9:9-13

9As they went back down the mountain, he told them not to tell anyone what they had seen until the Son of Man had risen from the dead.

10So they kept it to themselves, but they often asked each other what he meant by “rising from the dead.”

11Then they asked him, “Why do the teachers of religious law insist that Elijah must return before the Messiah comes?”

12Jesus responded, “Elijah is indeed coming first to get everything ready. Yet why do the Scriptures say that the Son of Man must suffer greatly and be treated with utter contempt?

13But I tell you, Elijah has already come, and they chose to abuse him, just as the Scriptures predicted.”