Matthew 17:16

13 Then understood the disciples that concerning John the Baptist he spake to them.

14 And when they came unto the multitude, there came to him a man, kneeling down to him,

15 and saying, `Sir, deal kindly with my son, for he is lunatic, and doth suffer miserably, for often he doth fall into the fire, and often into the water,

16 and I brought him near to thy disciples, and they were not able to heal him.`

17 And Jesus answering said, `O generation, unstedfast and perverse, till when shall I be with you? till when shall I bear you? bring him to me hither;`

18 and Jesus rebuked him, and the demon went out of him, and the lad was healed from that hour.

19 Then the disciples having come to Jesus by himself, said, `Wherefore were we not able to cast him out?`