English Standard Version
for you know that the testing of your faith produces steadfastness.

American Standard Version
Knowing that the proving of your faith worketh patience.

Berean Study Bible
because you know that the testing of your faith develops perseverance.

Douay-Rheims Bible
Knowing that the trying of your faith worketh patience.

English Revised Version
Knowing that the proof of your faith worketh patience.

King James Bible
Knowing this, that the trying of your faith worketh patience.

World English Bible
knowing that the testing of your faith produces endurance.

Young's Literal Translation
knowing that the proof of your faith doth work endurance,

James 1:3 Additional Translations ...