Mark 9:29 in the King James Version
And he said unto them, This kind can come forth by nothing, but by prayer and fasting.
Context
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.”
30 They went out from there and passed through Galilee. He didn’t want anyone to know it,