Matthew 17:14-20

American Standard Version

¹⁴ And when they were come to the multitude, there came to him a man, kneeling to him, and saying, ¹⁵ Lord, have mercy on my son: for he is epileptic, and suffereth grievously; for oft-times he falleth into the fire, and oft-times into the water. ¹⁶ And I brought him to thy disciples, and they could not cure him. ¹⁷ And Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I bear with you? bring him hither to me. ¹⁸ And Jesus rebuked him; and the demon went out of him: and the boy was cured from that hour.

¹⁹ Then came the disciples to Jesus apart, and said, Why could not we cast it out? ²⁰ And he saith unto them, Because of your little faith: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.^[a]