Matthew 17:19-21 Then coming the disciples to the Jesus by himself, said: Why we not were able to cast out it?

Diaglott⁽ⁱ⁾ ¹⁹ Then coming the disciples to the Jesus by himself, said: Why we not were able to cast out it? ²⁰ The and Jesus said to them: On account of the unbelief of you. Indeed for I say to you, If you have faith as a grain of mustard, you will say to the mountain this. Be thou removed from here there, and it will remove; and nothing will be impossible to you. ²¹ This but the kind not goes out, if not in prayer and fasting.