Matthew 17:10-13

Then his disciples asked him, “Why do the teachers of religious law insist that Elijah must return before the Messiah comes?” Jesus replied, “Elijah is indeed coming first to get everything ready. But I tell you, Elijah has already come, but he wasn’t recognized, and they chose to abuse him. And in the same way they will also make the Son of Man suffer.” Then the disciples realized he was talking about John the Baptist.