Matthew 17:16

Then the disciples understood that he spoke to them of John the Baptizer.

When they came to the multitude, a man came to him, kneeling down to him and saying,

“Lord, have mercy on my son, for he is epileptic and suffers grievously; for he often falls into the fire, and often into the water.

Jesus answered, “Faithless and perverse generation! How long will I be with you? How long will I bear with you? Bring him here to me.”

Jesus rebuked the demon, and it went out of him, and the boy was cured from that hour.

Then the disciples came to Jesus privately, and said, “Why weren’t we able to cast it out?”