In a quick check of a few versions, verses 20 and 21 are combined, as Matthew 17:20-21. Maybe because Jesus switches subject. The KJV leaves out 21.
St. Matthew 17:20 And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you. Howbeit this kind goeth not out but by prayer and fasting.
In a quick check of a few versions, verses 20 and 21 are combined, as Matthew 17:20-21. Maybe because Jesus switches subject. The KJV leaves out 21.
St. Matthew 17:20 And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you. Howbeit this kind goeth not out but by prayer and fasting.
I think the italicized part should have been 21.