Mark 9:20 (KJV)

And straightway all the people, when they beheld him, were greatly amazed, and running to him saluted him.

And he asked the scribes, What question ye with them?

And one of the multitude answered and said, Master, I have brought unto thee my son, which hath a dumb spirit;

And wheresoever he taketh him, he teareth him: and he foameth, and gnasheth with his teeth, and pineth away: and I spake to thy disciples that they should cast him out; and they could not.

He answereth him, and saith, O faithless generation, how long shall I be with you? how long shall I suffer you? bring him unto me.

And he asked his father, How long is it ago since this came unto him? And he said, Of a child.

And ofttimes it hath cast him into the fire, and into the waters, to destroy him: but if thou canst do any thing, have compassion on us, and help us.

Jesus said unto him, If thou canst believe, all things are possible to him that believeth.

And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.

When Jesus saw that the people came running together, he rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee, come out of him, and enter no more into him.