Matthew 17:19-21 Then the disciples having come to Jesus in private, said, Why could we not cast it out?

ACV⁽ⁱ⁾ ¹⁹ Then the disciples having come to Jesus in private, said, Why could we not cast it out? ²⁰ And Jesus said to them, Because of your unbelief. For truly I say to you, if ye have faith as a grain of a mustard plant, ye will say to this mountain, Remove from here to there, and it will depart, and nothing will be impossible to you. ²¹ But this kind does not go out except by prayer and fasting.