Mat Matthew, chapter The Gospel According to Matthew, chapter 17
He said to them: “Because of the limitation of your faith. Truly I say to you, if there be any faith in you, as a grain of mustard, if you believe, you will say to this mountain depart and it will depart; nothing will be withheld from you.”Mat 21:21; Mrk 9:23; Mrk 11:23; Luk 17:6
“But this kind of demon does not come out except by prayer and fasting.Mrk 9:29