However, this kind does not go out except by prayer and fasting - Matthew 17:20,21.
Jesus healed a demon-possessed boy
And when they had come to the multitude, a man came to Him, kneeling down to Him and saying, “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. So I brought him to Your disciples, but they could not cure him.” 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.” And Jesus rebuked the demon, and it came out of him; and the child was cured from that very hour - Matthew 17:14-19.
Except by prayer and fasting
Then the disciples came to Jesus privately and said, “Why could we not cast it out?”. 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. However, this kind does not go out except by prayer and fasting.” - Matthew 17:20,21.
Prayer
Devote yourselves to prayer, being watchful and thankful - Colossians 4:2. Pray in the Spirit on all occasions with all kinds of prayers and requests - Ephesians 6:18. Call to me and I will answer you and tell you great and unsearchable things you do not know - Jeremiah 33:3. Call upon Me in the day of trouble; I will deliver you, and you shall glorify Me - Psalm 50:15. Then you will call on me and come and pray to me, and I will listen to you - Jeremiah 29:12. The Lord is near to all who call on him, to all who call on him in truth - Psalm 145:18.
Fasting
I humbled myself with fasting - Psalm 35:13. Then I set my face toward the Lord God to make request by prayer and supplications, with fasting, sackcloth, and ashes - Daniel 9:3. But you, when you fast, anoint your head and wash your face, 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 - Mathew 6:17, 18.
PRAYER: Dear Lord, Let us devote ourselves to prayer and fasting. In Jesus' name we pray. Amen.