Mattithyahu (Matthew) 17:7, 20-21

But יהושע came near and touched them and said, “Rise, and do not be afraid.”

And יהושע said to them, “Because of your unbelief, for truly, I say to you, if you have belief as a mustard seed, you shall say to this mountain, ‘Move from here to there,’ and it shall move. And no matter shall be impossible for you. “But this kind does not go out except through prayer and fasting.”