Matthew 17:10-13

So the disciples asked him, “Why do the experts in Moses’ Teachings say that Elijah must come first?” Jesus answered, “Elijah is coming and will put everything in order again. Actually, I can guarantee that Elijah has already come. Yet, people treated him as they pleased because they didn’t recognize him. In the same way they’re going to make the Son of Man suffer.” Then the disciples understood that he was talking about John the Baptizer.