James 1:6

But let him ask in faith, not doubting; for he that doubts is like a wave of the sea, driven with the wind and agitated.

Ephesians 4:14

that we may be no longer children, driven about like waves and carried about with every wind of doctrine, by the art of men, and the craftiness of deceitful wiles,

Matthew 21:21-22

Jesus answered and said to them, I tell you truly, that if you have faith and doubt not, you shall not only do this of the fig tree, but if you should say to this mountain, Be taken up and be cast into the sea, it would be done;

Mark 11:22-24

And Jesus answered and said to them, Have faith in God;

1 Timothy 2:8

I wish also that men should pray everywhere, lifting up holy hands, without wrath and disputations;

Hebrews 10:23

let us hold firmly the profession of the faith, without declining; for he is faithful that promised;

Hebrews 11:6

but without faith it is impossible to please; for he that comes to God, must believe that he is and that he is a rewarder of those that seek him.

Hebrews 13:9

Be not carried about with various and strange doctrines; for it is good that the mind should be established with grace, not with aliments, in which those walking are not profited.

2 Peter 2:17

These are fountains without water, clouds driven by a tempest, to which is reserved the blackness of darkness.

Jude 1:12-13

These are breakers at your love-feasts, feasting with you without fear, feeding themselves, clouds without water driven about by winds, autumnal trees without fruit, twice dead, plucked up by the roots,

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 whatever which you ask in prayer believing, you shall receive.
Mark 11:22
And Jesus answered and said to them, Have faith in God;
1 Timothy 2:8
I wish also that men should pray everywhere, lifting up holy hands, without wrath and disputations;
Hebrews 11:6
but without faith it is impossible to please; for he that comes to God, must believe that he is and that he is a rewarder of those that seek him.

He

Ephesians 4:14
that we may be no longer children, driven about like waves and carried about with every wind of doctrine, by the art of men, and the craftiness of deceitful wiles,
Hebrews 10:23
let us hold firmly the profession of the faith, without declining; for he is faithful that promised;
Hebrews 13:9
Be not carried about with various and strange doctrines; for it is good that the mind should be established with grace, not with aliments, in which those walking are not profited.
2 Peter 2:17
These are fountains without water, clouds driven by a tempest, to which is reserved the blackness of darkness.
Jude 1:12
These are breakers at your love-feasts, feasting with you without fear, feeding themselves, clouds without water driven about by winds, autumnal trees without fruit, twice dead, plucked up by the roots,