1 Thessalonians 2:10

10 You are witnesses, and so is God, of how holy, righteous and blameless we were among you who believed.

Read 1 Thessalonians 2:10 Using Other Translations

Ye are witnesses, and God also, how holily and justly and unblameably we behaved ourselves among you that believe:
You are witnesses, and God also, how holy and righteous and blameless was our conduct toward you believers.
You yourselves are our witnesses—and so is God—that we were devout and honest and faultless toward all of you believers.