Didache

Therefore, appoint for yourselves bishops and deacons worthy of the Lord, men meek, and not lovers of money, 1 Timothy 3:4 and truthful and proven; for they also render to you the service of prophets and teachers. Despise them not therefore, for they are your honoured ones, together with the prophets and teachers. And reprove one another, not in anger, but in peace, as you have it in the Gospel; Matthew 18:15-17 but to every one that acts amiss against another, let no one speak, nor let him hear anything from you until he repents. But your prayers and alms and all your deeds so do, as you have it in the Gospel of our Lord.