Matthew 17:21

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

Mark 9:29

And he said unto them, "This kind can by no other means come forth, but by prayer and fasting."

1 Kings 17:20-21

and called unto the LORD and said, "O LORD my God, hast thou been so evil unto the widow with whom I sojourn, that thou hast slain her son?"

Daniel 9:3

and I turned me unto God the LORD, for to pray and make mine intercession, with fasting, sack cloth and ashes.

Matthew 12:45

Then he goeth his way, and taketh unto him seven other spirits worse than himself, and so enter they in and dwell there. And the end of that man is worse than the beginning. Even so shall it be with this evil nation."

Acts 13:2-3

As they ministered to the Lord and fasted; The holy ghost said, "Separate me Barnabas and Saul, for the work whereunto I have called them."

Acts 14:23

And when they had ordained them elders by election in every congregation, after they had prayed and fasted, they commended them to God on whom they believed.

1 Corinthians 7:5

Withdraw not yourselves one from another except it be with consent for a time, for to give yourselves to fasting and prayer, and afterward come again to the same thing, lest Satan tempt you for your incontinency.

2 Corinthians 11:27

in labour and travail, in watching often, in hunger, in thirst, in fastings often, in cold and in nakedness.

Ephesians 6:18

and pray always with all manner prayer and supplication - and that in the spirit - and watch thereunto with all instance and supplication for all saints,

Treasury of Scripture Knowledge

Summary

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

Bible References

This

Matthew 12:45
Then he goeth his way, and taketh unto him seven other spirits worse than himself, and so enter they in and dwell there. And the end of that man is worse than the beginning. Even so shall it be with this evil nation."

But

1 Kings 17:20
and called unto the LORD and said, "O LORD my God, hast thou been so evil unto the widow with whom I sojourn, that thou hast slain her son?"
Daniel 9:3
and I turned me unto God the LORD, for to pray and make mine intercession, with fasting, sack cloth and ashes.
Mark 9:29
And he said unto them, "This kind can by no other means come forth, but by prayer and fasting."
Acts 13:2
As they ministered to the Lord and fasted; The holy ghost said, "Separate me Barnabas and Saul, for the work whereunto I have called them."
Acts 14:23
And when they had ordained them elders by election in every congregation, after they had prayed and fasted, they commended them to God on whom they believed.
1 Corinthians 7:5
Withdraw not yourselves one from another except it be with consent for a time, for to give yourselves to fasting and prayer, and afterward come again to the same thing, lest Satan tempt you for your incontinency.
2 Corinthians 11:27
in labour and travail, in watching often, in hunger, in thirst, in fastings often, in cold and in nakedness.
Ephesians 6:18
and pray always with all manner prayer and supplication - and that in the spirit - and watch thereunto with all instance and supplication for all saints,