Matthew 17:19
New International Reader's Version Bible (NIRV)Then the disciples came to Jesus in private. They asked, “Why couldn’t we drive out the demon?”
20-21 He replied, “Because your faith is much too small. What I’m about to tell you is true. If you have faith as small as a mustard seed, it is enough. You can say to this mountain, ‘Move from here to there.’ And it will move. Nothing will be impossible for you.”