Mark 9:25-29

25When Jesus saw that a crowd was running to the scene, he rebuked the impure spirit. “You deaf and mute spirit,” he said, “I command you, come out of him and never enter him again.” 26The spirit shrieked, convulsed him violently and came out. The boy looked so much like a corpse that many said, “He’s dead.”

27But Jesus took him by the hand and lifted him to his feet, and he stood up.

28After Jesus had gone indoors, his disciples asked him privately, “Why couldn’t we drive it out?”

29He replied, “This kind can come out only by prayer. Some manuscripts prayer and fasting ”