New Living Translation
But when you ask him, be sure that your faith is in God alone. Do not waver, for a person with divided loyalty is as unsettled as a wave of the sea that is blown and tossed by the wind.

American Standard Version
But let him ask in faith, nothing doubting: for he that doubteth is like the surge of the sea driven by the wind and tossed.

Berean Study Bible
But he must ask in faith, without doubting, because he who doubts is like a wave of the sea, blown and tossed by the wind.

Douay-Rheims Bible
But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea, which is moved and carried about by the wind.

English Revised Version
But let him ask in faith, nothing doubting: for he that doubteth is like the surge of the sea driven by the wind and tossed.

King James Bible
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.

World English Bible
But let him ask in faith, without any doubting, for he who doubts is like a wave of the sea, driven by the wind and tossed.

Young's Literal Translation
and let him ask in faith, nothing doubting, for he who is doubting hath been like a wave of the sea, driven by wind and tossed,

James 1:6 Additional Translations ...