NET
10 You are witnesses, and so is God, as to how holy and righteous and blameless our conduct was toward you who believe.
Darby
10 *Ye* [are] witnesses, and God, how piously and righteously and blamelessly we have conducted ourselves with you that believe:
KJV
10 Ye [are] witnesses, and God [also], how holily and justly and unblameably we behaved ourselves among you that believe: