Matthew 17:19-21
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19Then the disciples came to Jesus privately and said, “Why could we not cast it out?” 20And He *said to them, “Because of your meager faith; for truly I say to you, if you have faith the size of 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.”
21But this kind doesn`t go out except by prayer and fasting."