Matthew 17:21 in the King James Version
Howbeit this kind goeth not out but by prayer and fasting.
Context
20 He said to them, “Because of your unbelief. For most certainly I tell you, if you have faith as a grain of mustard seed, you will tell this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.
21 But this kind doesn’t go out except by prayer and fasting.”
22 While they were staying in Galilee, Jesus said to them, “The Son of Man is about to be delivered up into the hands of men,