KJV(i)
14 And when they were come to the multitude, there came to him a certain man, kneeling down to him, and saying,
15 Lord, have mercy on my son: for he is lunatick, and sore vexed: for ofttimes he falleth into the fire, and oft into the water.
16 And I brought him to thy disciples, and they could not cure him.
17 Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I suffer you? bring him hither to me.
18 And Jesus rebuked the devil; and he departed out of him: and the child was cured from that very hour.
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 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.
21 Howbeit this kind goeth not out but by prayer and fasting.
Matthew 17:14-21
RKJNT(i)
14 And when they had come to the multitude, a certain man came to him, kneeling down before him, and saying,
15 Lord, have mercy on my son: for he is epileptic, and severely vexed: for often he falls into the fire, and often into the water.
16 And I brought him to your disciples, and they could not cure him.
17 Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I endure you? bring him here to me.
18 And Jesus rebuked the devil; and it departed out of him: and the boy was cured from that very hour.
19 Then the disciples came to Jesus privately, and 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 you have faith as a grain of mustard seed, you shall say to this mountain, Move from here to there; and it shall move; and nothing shall be impossible for you.
21 [Yet this kind does not go out except by prayer and fasting.]