'Blameless' in the Bible

You are witnesses, and so is God, how unworldly and just and blameless was our behavior toward you who believe [in our Lord Jesus Christ].

Now may the God of peace Himself sanctify you through and through [that is, separate you from profane and vulgar things, make you pure and whole and undamaged—consecrated to Him—set apart for His purpose]; and may your spirit and soul and body be kept complete and [be found] blameless at the coming of our Lord Jesus Christ.