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.
It is to be noted, that onewhile the Lord brings the offender to him whom he has offended; as when he says, If thou remember that thy brother has might against thee, go, be reconciled to thy brother: (Mat. 5:23.) otherwhiles He bids him that has suffered the wrong to forgive his neighbour; as where he says, Forgive us our debts, as we also forgive our debtors. (Mat. 6:12.) Here He has devised yet another method, for He brings him who has been grieved to him that grieved him, and therefore says, If thy brother sin against thee; for because he that did the wrong would not readily come to make amends, because of his shame, He draws to him him that has suffered the wrong; and not only draws him there, but with the very purpose of correcting what was done amiss; whence He says, Go and tell hint his fault.