Matthew 17:19

16 And I brought him to thy disciples, and they could not cure him.

17 And Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I bear with you? bring him hither to me.

18 And Jesus rebuked him; and the demon went out of him: and the boy was cured from that hour.

19 Then came the disciples to Jesus apart, and said, Why could not we cast it out?

20 And he saith unto them, Because of your little faith: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.

21 [But this kind goeth not out save by prayer and fasting.]

22 And while they abode in Galilee, Jesus said unto them, The Son of man shall be delivered up into the hands of men;