As Jesus, Peter, James,and John were coming back down the mountain, they saw a crowd with a demon possessed child in their midst. The disciple had commanded the demon to come out but it didn't.
37 On the next day, when they had come down from the mountain, a great crowd met him.38 And behold, a man from the crowd cried out, “Teacher, I beg you to look at my son, for he is my only child.39 And behold, a spirit seizes him, and he suddenly cries out. It convulses him so that he foams at the mouth, and shatters him, and will hardly leave him.40 And I begged your disciples to cast it out, but they could not.”41 Jesus answered, “O faithless and twisted generation, how long am I to be with you and bear with you? Bring your son here.”42 While he was coming, the demon threw him to the ground and convulsed him. But Jesus rebuked the unclean spirit and healed the boy, and gave him back to his father.43 And all were astonished at the majesty of God. But while they were all marveling at everything he was doing, Jesus said to his disciples,
Matthew 17
16 And I brought him to your disciples, and they could not heal him.”17 And 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.”18 And Jesus rebuked the demon, and it came out of him, and the boy was healed instantly.
