Mark 9:27-29

Young's Literal Translation

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.'