Matthew 17:19-21
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19Then the disciples came to Jesus privately, and said, "Why couldn`t we cast it out?" 20He said to them, "Because of your unbelief. For most assuredly 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 to you.
21But this kind doesn`t go out except by prayer and fasting."
Matthew 17:19-21 (WEB)