Matthew 18:16
But if he does not listen [to your reasoning], take one or two other people with you, so that two or three witnesses can verify every word [that was said].
1 Corinthians 6:4-5
So then, if you have cases [or, courts] for deciding matters of this life, do you appoint [as judges] those who have no standing in the church? [i.e., heathens]. [Note: This difficult passage may also be taken as a statement, using sarcasm, "you appoint as judges..."].
1 Thessalonians 2:10
You can testify, [just] as God can, how holy, righteous and blameless our conduct was toward you believers.
Hebrews 13:18
Pray for us [continually]. We are convinced that we [i.e., the writer of Hebrews] have a clear conscience [i.e., regarding our relationship to you] and we want to behave properly in every way.
1 Peter 2:12
You should live such good lives before [unconverted] Gentiles, so that even though they accuse you of being evildoers, by seeing your good deeds, they will [be led to] honor God [for you] on the day He visits us again [i.e., to bring judgment].
1 Peter 3:16
May your conscience be able to so approve of your conduct that, even if you are ridiculed, those doing it will [eventually] have to be ashamed [of themselves] for criticizing your Christian behavior.