Matthew 17:19-21 Then came the disciples to Jesus apart, and said, Why could not we cast him out?

KJC⁽ⁱ⁾ ¹⁹ Then came the disciples to Jesus apart, and said, Why could not we cast him out? ²⁰ And Jesus said unto them, Because of your unbelief: for truthfully I say unto you, If you have faith as a grain of mustard seed, you shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you. ²¹ But this kind goes not out except by prayer and fasting.