James 1:6

But let him ask in faith, nothing doubting; for he that doubteth is like a wave of the sea blown about and tossed by the wind.

Ephesians 4:14

That we may be no longer children fluctuating and carried about with every wind of doctrine, by the artful insinuations of men, and their crafty methods of deceiving;

Matthew 21:21-22

but Jesus answering said unto them, Verily I tell you, if ye have faith and doubt not, ye shall not only be able to do this to a fig-tree, but also if ye shall say to this mountain, "Be thou removed and cast into the sea," it shall be done.

Mark 11:22-24

And Jesus answering saith unto them, Have faith in God: for verily I tell you,

1 Timothy 2:8

I direct therefore that men pray in every place, lifting up holy hands without wrath and debate:

Hebrews 10:23

Let us inflexibly retain the profession of our hope,

Hebrews 11:6

whereas without faith it is impossible to please Him; for he that cometh to God must believe, that He is, and is the rewarder of them that diligently seek Him.

Hebrews 13:9

be not then carried about by various and strange doctrines; for it is good that the heart be established by grace, and not in meats, in which those that have been most exact, have not profited by them.

2 Peter 2:17

These are wells without water, clouds driven by a storm, for whom thick darkness is reserved for ever.

Jude 1:12-13

These are spots in your love-feasts, feeding themselves without fear, when they are feasting with you: clouds without water, carried about by the winds; trees withered and without fruit, twice dead and rooted up; raging waves of the sea, foaming out their own shame;

Treasury of Scripture Knowledge

Summary

But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.

Bible References

Let

Matthew 21:22
And all things whatsoever ye ask in prayer, believing, ye shall receive.
Mark 11:22
And Jesus answering saith unto them, Have faith in God: for verily I tell you,
1 Timothy 2:8
I direct therefore that men pray in every place, lifting up holy hands without wrath and debate:
Hebrews 11:6
whereas without faith it is impossible to please Him; for he that cometh to God must believe, that He is, and is the rewarder of them that diligently seek Him.

He

Ephesians 4:14
That we may be no longer children fluctuating and carried about with every wind of doctrine, by the artful insinuations of men, and their crafty methods of deceiving;
Hebrews 10:23
Let us inflexibly retain the profession of our hope,
Hebrews 13:9
be not then carried about by various and strange doctrines; for it is good that the heart be established by grace, and not in meats, in which those that have been most exact, have not profited by them.
2 Peter 2:17
These are wells without water, clouds driven by a storm, for whom thick darkness is reserved for ever.
Jude 1:12
These are spots in your love-feasts, feeding themselves without fear, when they are feasting with you: clouds without water, carried about by the winds; trees withered and without fruit, twice dead and rooted up; raging waves of the sea, foaming out their own shame;