Matthew 5:37 “But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.”

Philippians 1:27 “Only let your conversation be as it becometh the gospel of Christ: that whether I come and see you, or else be absent, I may hear of your affairs, that ye stand fast in one spirit, with one mind striving together for the faith of the gospel”