Matthew 17:15-20 English Standard Version (ESV)

¹⁵ said, “Lord, have mercy on my son, for he has seizures and he suffers terribly. For often he falls into the fire, and often into the water. ¹⁶ And I brought him to your disciples, and they could not heal him.” ¹⁷ And Jesus answered, “O faithless and twisted generation, how long am I to be with you? How long am I to bear with you? Bring him here to me.” ¹⁸ And Jesus rebuked the demon,^[a] and it^[b] came out of him, and the boy was healed instantly.^{[c] 19} Then the disciples came to Jesus privately and said, “Why could we not cast it out?” ²⁰ He said to them, “Because of your little faith. For truly, I say to you, if you have faith like a grain of mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move, and nothing will be impossible for you.”^[d]