Mark 9:28 in the King James Version
And when he was come into the house, his disciples asked him privately, Why could not we cast him out?
Context
27 But Jesus took him by the hand and raised him up; and he arose.
28 When he had come into the house, his disciples asked him privately, “Why couldn’t we cast it out?”
29 He said to them, “This kind can come out by nothing but by prayer and fasting.”