Matthew 17:9-13

As they were coming down the mountain, Jesus commanded them not to tell anyone about what they had seen until the Son of Man had risen from the dead. Then his followers asked him, “Why do the teachers of the law say that Elijah must come first?” Jesus answered, “They are right to say that Elijah is coming and that he will make everything the way it should be. But I tell you that Elijah has already come, and they did not recognize him. They did to him whatever they wanted to do. It will be the same with the Son of Man; those same people will make the Son of Man suffer.” Then the followers understood that Jesus was talking about John the Baptist.