James 1:6

But let him ask in faith, harbouring no doubt: for he who is doubtful is like a wave of the sea, driven by the wind, and in constant agitation.

Ephesians 4:14

that we should be no longer infants, floating on the waves, and carried about with every wind of novel doctrine, by the juggling of men, by their craftiness after the delusive wiles of error;

Matthew 21:21-22

But Jesus addressing them, said, Verily I tell you, if ye have faith, and entertain no doubt, not only shall ye do what is done to the fig-tree, but if ye should even say to this mountain, Be lifted up, and be cast into the sea, it be done.

Mark 11:22-24

And Jesus answering said to them, Have faith in God.

1 Timothy 2:8

I will then that men pray in every place, lifting up holy hands without wrath or doubting:

Hebrews 10:23

let us hold fast the profession of hope unwavering, (for he who promises is faithful.)

Hebrews 11:6

But without faith it is impossible to be acceptable; for he must believe, who cometh unto God, that he exists, and is a rewarder of those who diligently seek him.

Hebrews 13:9

Be not tossed about by various and strange doctrines: for it is good to have the heart firmly established by grace, not by meats, in which observances they who have walked have found no manner of advantage.

2 Peter 2:17

These are fountains without water, clouds driven by a hurricane; for whom the blackness of darkness for ever is reserved.

Jude 1:12-13

These are in your feasts of love, as sunken rocks; though joining in your banquet, they feed themselves fearlessly; clouds without water carried about by the winds; trees untimely withering, fruitless, twice dead, rooted up;

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 shall ask in prayer, believing, ye shall receive.
Mark 11:22
And Jesus answering said to them, Have faith in God.
1 Timothy 2:8
I will then that men pray in every place, lifting up holy hands without wrath or doubting:
Hebrews 11:6
But without faith it is impossible to be acceptable; for he must believe, who cometh unto God, that he exists, and is a rewarder of those who diligently seek him.

He

Ephesians 4:14
that we should be no longer infants, floating on the waves, and carried about with every wind of novel doctrine, by the juggling of men, by their craftiness after the delusive wiles of error;
Hebrews 10:23
let us hold fast the profession of hope unwavering, (for he who promises is faithful.)
Hebrews 13:9
Be not tossed about by various and strange doctrines: for it is good to have the heart firmly established by grace, not by meats, in which observances they who have walked have found no manner of advantage.
2 Peter 2:17
These are fountains without water, clouds driven by a hurricane; for whom the blackness of darkness for ever is reserved.
Jude 1:12
These are in your feasts of love, as sunken rocks; though joining in your banquet, they feed themselves fearlessly; clouds without water carried about by the winds; trees untimely withering, fruitless, twice dead, rooted up;