Matthew 17:17-19

Young's Literal Translation

¹⁷ And Jesus answering said, `O generation, unstedfast and perverse, till when shall I be with you? till when shall I bear you? bring him to me hither;'

¹⁸ and Jesus rebuked him, and the demon went out of him, and the lad was healed from that hour.

¹⁹ Then the disciples having come to Jesus by himself, said, `Wherefore were we not able to cast him out?'