Matthew 17:21

But this kind goeth not out save by prayer and fasting.

Mark 9:29

And he said unto them, This kind can come out by nothing, save by prayer.

1 Kings 17:20-21

And he cried unto Jehovah, and said, O Jehovah my God, hast thou also brought evil upon the widow with whom I sojourn, by slaying her son?

Daniel 9:3

And I set my face unto the Lord God, to seek by prayer and supplications, with fasting and sackcloth and ashes.

Matthew 12:45

Then goeth he, and taketh with himself seven other spirits more evil than himself, and they enter in and dwell there: and the last state of that man becometh worse than the first. Even so shall it be also unto this evil generation.

Acts 13:2-3

And as they ministered to the Lord, and fasted, the Holy Spirit said, Separate me Barnabas and Saul for the work whereunto I have called them.

Acts 14:23

And when they had appointed for them elders in every church, and had prayed with fasting, they commended them to the Lord, on whom they had believed.

1 Corinthians 7:5

Defraud ye not one the other, except it be by consent for a season, that ye may give yourselves unto prayer, and may be together again, that Satan tempt you not because of your incontinency.

2 Corinthians 11:27

in labor and travail, in watchings often, in hunger and thirst, in fastings often, in cold and nakedness.

Ephesians 6:18

with all prayer and supplication praying at all seasons in the Spirit, and watching thereunto in all perseverance and supplication for all the saints,

Treasury of Scripture Knowledge

Summary

Howbeit this kind goeth not out but by prayer and fasting.

Bible References

This

Matthew 12:45
Then goeth he, and taketh with himself seven other spirits more evil than himself, and they enter in and dwell there: and the last state of that man becometh worse than the first. Even so shall it be also unto this evil generation.

But

1 Kings 17:20
And he cried unto Jehovah, and said, O Jehovah my God, hast thou also brought evil upon the widow with whom I sojourn, by slaying her son?
Daniel 9:3
And I set my face unto the Lord God, to seek by prayer and supplications, with fasting and sackcloth and ashes.
Mark 9:29
And he said unto them, This kind can come out by nothing, save by prayer.
Acts 13:2
And as they ministered to the Lord, and fasted, the Holy Spirit said, Separate me Barnabas and Saul for the work whereunto I have called them.
Acts 14:23
And when they had appointed for them elders in every church, and had prayed with fasting, they commended them to the Lord, on whom they had believed.
1 Corinthians 7:5
Defraud ye not one the other, except it be by consent for a season, that ye may give yourselves unto prayer, and may be together again, that Satan tempt you not because of your incontinency.
2 Corinthians 11:27
in labor and travail, in watchings often, in hunger and thirst, in fastings often, in cold and nakedness.
Ephesians 6:18
with all prayer and supplication praying at all seasons in the Spirit, and watching thereunto in all perseverance and supplication for all the saints,

American Standard Version Public Domain