Mat Matthew, chapter The Gospel According to Matthew, chapter 17
And Jesus said to them, “Through yöur want of faith; for truly I say to yöu, if yöu may have faith as a grain of mustard, yöu will say to this mountain, Move from here to there, and it will move, and nothing will be impossible to yöu, Mat 21:21; Mrk 9:23; Mrk 11:23; Luk 17:6[[and this kind does not go forth except in prayer and fasting.”]] Mrk 9:29