Matthew 17:15-21

The man said, “Lord, have mercy on my son. He has epilepsy and is suffering very much, because he often falls into the fire or into the water. I brought him to your followers, but they could not cure him.” Jesus answered, “You people have no faith, and your lives are all wrong. How long must I put up with you? How long must I continue to be patient with you? Bring the boy here.” Jesus commanded the demon inside the boy. Then the demon came out, and the boy was healed from that time on. The followers came to Jesus when he was alone and asked, “Why couldn’t we force the demon out?” Jesus answered, “Because your faith is too small. I tell you the truth, if your faith is as big as a mustard seed, you can say to this mountain, ‘Move from here to there,’ and it will move. All things will be possible for you. [That kind of spirit comes out only if you use prayer and fasting.]”