Mark 9:26

23 Jesus said to him, "If you can believe? All things are possible to him who believes."

24 Immediately the father of the child cried out with tears, "I believe. Help my unbelief!"

25 When Jesus saw that a multitude came running together, he rebuked the unclean spirit, saying to him, "You mute and deaf spirit, I command you, come out of him, and enter no more into him!"

26 Having cried out, and convulsed him greatly, it came out. The boy became like one dead; so much that most of them said, "He is dead."

27 But Jesus took him by the hand, and raised him up; and he arose.

28 When he had come into the house, his disciples asked him privately, "Why couldn`t we cast it out?"

29 He said to them, "This kind can come out by nothing, except by prayer and fasting."