Matthew 17:18-20

World English Bible

¹⁸ Jesus rebuked the demon, and it went out of him, and the boy was cured from that hour.

¹⁹ Then the disciples came to Jesus privately, and said, “Why weren’t we able to cast it out?”

²⁰ He said to them, “Because of your unbelief. For most certainly I tell you, if you have faith as a grain of mustard seed, you will tell this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.