Mark 9:18

15 And straightway all the multitude, when they saw him, were greatly amazed, and running to him saluted him.

16 And he asked them, What question ye with them?

17 And one of the multitude answered him, Teacher, I brought unto thee my son, who hath a dumb spirit;

18 and wheresoever it taketh him, it dasheth him down: and he foameth, and grindeth his teeth, and pineth away: and I spake to thy disciples that they should cast it out; and they were not able.

19 And he answereth them and saith, O faithless generation, how long shall I be with you? how long shall I bear with you? bring him unto me.

20 And they brought him unto him: and when he saw him, straightway the spirit tare him grievously; and he fell on the ground, and wallowed foaming.

21 And he asked his father, How long time is it since this hath come unto him? And he said, From a child.