Mark 9:27 YLT

²⁵  Jesus having seen that a multitude doth run together, rebuked the unclean spirit, saying to it, 'Spirit -- dumb and deaf -- I charge thee, come forth out of him, and no more thou mayest enter into him;'

²⁶  and having cried, and rent him much, it came forth, and he became as dead, so that many said that he was dead,

²⁷  but Jesus, having taken him by the hand, lifted him up, and he arose.

²⁸  And he having come into the house, his disciples were questioning him by himself -- 'Why were we not able to cast it forth?'

²⁹  And he said to them, 'This kind is able to come forth with nothing except with prayer and fasting.'