New Living Translation
You yourselves are our witnesses—and so is God—that we were devout and honest and faultless toward all of you believers.

American Standard Version
Ye are witnesses, and God also , how holily and righteously and unblameably we behaved ourselves toward you that believe:

Berean Study Bible
You are witnesses, and so is God, of how holy, righteous, and blameless our conduct was among you who believed.

Douay-Rheims Bible
You are witnesses, and God also, how holily, and justly, and without blame, we have been to you that have believed:

English Revised Version
Ye are witnesses, and God also, how holily and righteously and unblameably we behaved ourselves toward you that believe:

King James Bible
Ye are witnesses, and God also, how holily and justly and unblameably we behaved ourselves among you that believe:

World English Bible
You are witnesses with God, how holy, righteously, and blamelessly we behaved ourselves toward you who believe.

Young's Literal Translation
ye are witnesses -- God also -- how kindly and righteously, and blamelessly to you who believe we became,

1 Thessalonians 2:10 Additional Translations ...