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

UKJV⁽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 verily I say unto you, If all of you have faith as a grain of mustard seed, all of you shall say unto this mountain, Remove behind to yonder place; and it shall remove; and nothing shall be impossible unto you. ²¹ Nevertheless this kind goes not out but by prayer and fasting.