Mark 9:25-29

When Jesus saw that a crowd was rapidly gathering, He rebuked the unclean spirit, saying to it, “You deaf and mute spirit, I command you, come out of him and do not enter him again.” After crying out and throwing him into terrible convulsions, it came out; and the boy became so much like a corpse that most of them said, “He is dead!” But Jesus took him by the hand and raised him; and he got up. When He came into the house, His disciples began questioning Him privately, “Why could we not drive it out?” And He said to them, “This kind cannot come out by anything but prayer.”