Mark 9:12-21

12And he said unto them, Elijah indeed cometh first, and restoreth all things: and how is it written of the Son of man, that he should suffer many things and be set at nought? 13But I say unto you, that Elijah is come, and they have also done unto him whatsoever they would, even as it is written of him.

14And when they came to the disciples, they saw a great multitude about them, and scribes questioning with them. 15And straightway all the multitude, when they saw him, were greatly amazed, and running to him saluted him. 16And he asked them, What question ye with them? 17And one of the multitude answered him, Teacher, I brought unto thee my son, who hath a dumb spirit; 18and 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. 19And 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. 20And 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. 21And he asked his father, How long time is it since this hath come unto him? And he said, From a child.