John Chrysostom
Catena Aurea · Matthäusevangelium 18
Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother. But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. And if he shall neglect to hear them, tell it unto the Church: but if he neglect to hear the Church, let him be unto thee as an heathen man and a Publican.
(Hom. lx.) Having above given a severe sentence against those who were the cause of offence, making them to fear on all sides; so now that they to whom the offence is offered should not fall into the opposite fault of supineness and indifference, seeking to spare themselves in all things, and so be puffed up; the Lord here checks such a tendency, commanding that they be reproved, saying, If thy brother shall trespass against thee, go, tell him his fault between thee and him alone.