Matthew 17:20-21

New King James Version

²⁰ So Jesus said to them, “Because of your ^[a]unbelief; for assuredly, I say to you, ^(A)if you have faith as a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you. ^21 [b]However, this kind does not go out except by prayer and fasting.”