Matthew 17:9-18
English Standard Version
Chapter 17
9And as they were coming down the mountain, Jesus commanded them, "Tell no one the vision, until the Son of Man is raised from the dead." 10And the disciples asked him, "Then why do the scribes say that first Elijah must come?" 11He answered, "Elijah does come, and he will restore all things. 12But I tell you that Elijah has already come, and they did not recognize him, but did to him whatever they pleased. So also the Son of Man will certainly suffer at their hands." 13Then the disciples understood that he was speaking to them of John the Baptist.
14And when they came to the crowd, a man came up to him and, kneeling before him,
15said, "Lord, have mercy on my son, for he has seizures and he suffers terribly. For often he falls into the fire, and often into the water.
16And I brought him to your disciples, and they could not heal him."
17And Jesus answered, "O faithless and twisted generation, how long am I to be with you? How long am I to bear with you? Bring him here to me."
18And Jesus rebuked the demon, and it came out of him, and the boy was healed instantly.
