Matthew 17:10-20

10 And his disciples questioned him, saying, `Why then do the scribes say that Elijah it behoveth to come first?'

11 And Jesus answering said to them, `Elijah doth indeed come first, and shall restore all things,

12 and I say to you -- Elijah did already come, and they did not know him, but did with him whatever they would, so also the Son of Man is about to suffer by them.'

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?'

20 And Jesus said to them, `Through your want of faith; for verily I say to you, if ye may have faith as a grain of mustard, ye shall say to this mount, Remove hence to yonder place, and it shall remove, and nothing shall be impossible to you,