And wheresoever he taketh him, he teareth him: and he foameth, and gnasheth with his teeth, and pineth away: and I spake to thy disciples that they should cast him out; and they could not. (9:18)

And when he was come into the house, his disciples asked him privately, Why could not we cast him out? (9:28)

And he said unto them, This kind can come forth by nothing, but by prayer and fasting. (9:29)