The Gospel of Matthew Chapter 17:14-21

And when they had come to the multitude, a man came to Him, kneeling down to Him and saying,
15 “Lord, have mercy on my son, for he is an epileptic and suffers severely; for he often falls into the fire and often into the water.
16 “So I brought him to Your disciples, but 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 bear with you? Bring him here to Me.”
18 And Jesus rebuked the demon, and it came out of him; and the child was cured from that very hour.
19 Then the disciples came to Jesus privately and said, “Why could we not cast it out?”
20 So Jesus said to them, “Because of your unbelief; for assuredly, I say to you, if you have faith as a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.
21 “However, this kind does not go out except by prayer and fasting.”

Scripture taken from the New King James Version®, Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.

The Gospel of Matthew Chapter 9:14-17

Then the disciples of John came to Him, saying, “Why do we and the Pharisees fast often, but Your disciples do not fast?”
15 And Jesus said to them, “Can the friends of the bridegroom mourn as long as the bridegroom is with them? But the days will come when the bridegroom will be taken away from them, and then they will fast.
16 “No one puts a piece of unshrunk cloth on an old garment; for the patch pulls away from the garment, and the tear is made worse.
17 “Nor do they put new wine into old wineskins, or else the wineskins break, the wine is spilled, and the wineskins are ruined. But they put new wine into new wineskins, and both are preserved.”

Scripture taken from the New King James Version®, Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.

The Gospel of Matthew Chapter 6:16-18

“Moreover, when you fast, do not be like the hypocrites, with a sad countenance. For they disfigure their faces that they may appear to men to be fasting. Assuredly, I say to you, they have their reward.
17 “But you, when you fast, anoint your head and wash your face,
18 “so that you do not appear to men to be fasting, but to your Father who is in the secret place; and your Father who sees in secret will reward you openly.

Scripture taken from the New King James Version®, Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.