10. And the disciples asked him, saying, “Then why do the scribes say that Elijah must come first?”
11. And he answered and said, “Elijah indeed is coming, and will restore all things.
12. But I say to you that Elijah has already come, and they did not recognize him, but did with him whatever they wanted. In the same way also the Son of Man is going to suffer at their hands.”
13. Then the disciples understood that he had spoken to them about John the Baptist.
14. And when they came to the crowd, a man approached him, kneeling down before him
15. and saying, “Lord, have mercy on my son, because he has seizures and suffers severely, for often he falls into the fire and often into the water.
16. And I brought him to your disciples, and they were not able to heal him.”
17. And Jesus answered and said, “O unbelieving and perverse generation! How long will I be with you? How long must I put up with you? Bring him here to me!”
18. And Jesus rebuked him, and the demon came out of him and the boy was healed from that hour.
19. Then the disciples approached Jesus privately and said, Why were we not able to expel it?”
20. And he said to them, “Because of your little faith. For truly I say to you, if you have faith like a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move, and nothing will be impossible for you.”