09/06/2026
Immanuel (Augsburg) Lutheran Church
Shobonier, Illinois
Pentecost 15A - Proper 18A
September 6, 2026
Matthew 18:15-20
Brotherly Love
“If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother. But if he does not listen, take one or two others along with you, that every charge may be established by the evidence of two or three witnesses. If he refuses to listen to them, tell it to the church. And if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector.” (Matthew 18:15-17 ESV)
Dearly Beloved for whom Christ died and rose again,
Jesus said, “A new commandment I give to you, that you love one another; as I have loved you, that you also love one another. By this all will know that you are My disciples, if you have love for one another.” (John 13:34-35). And how does such love express itself? Jesus tells us one way in today’s Gospel which was just read. He tells us that we should love each other enough to confront our brother, our fellow believer, with his sin so that he may turn from it and live.
You see, as members of Christ’s body, we all have a vested interest in each other. When one part of the body hurts, the whole body suffers. And nothing hurts the body more than sin, especially persistent, willful sin. Such sin destroys faith since the Holy Spirit does not abide with sin. Such sin is like a cancer that will destroy the body unless it is removed. So it is that our Lord tells us of our responsibility to warn our brother of his sin.
But before we get to the steps of *how* we are to do that, we need to hear how seriously God takes sin. I’ve heard it said that “When the pastor talks about other people’s sin, that’s Law preaching. When he talks about *my* sin, that’s meddling.” And, meddling is exactly what is needed today. Far too often you and I are among those who excuse their sin, rationalize their sin away, wink and nod at sin as though it were no big deal. We don’t mind saying “I’m a sinner,” as long as it’s understood that everyone else is a sinner too. But when we are confronted with our own, specific sin, we become very uncomfortable and defensive. We become like Adam and Eve and run for the fig leaves and hide in the bushes from God. But the truth is, whenever God's Law calls "all of us" sinners, He is looking directly at each of us individually. You and me alike.
God takes sin seriously, and He wants us to realize the seriousness of sin, especially our own. That’s why He gave us the Law to show us our sin. That’s why He tells us that if we break just one of the commandments, we are guilty of breaking them all (James 2:10). Yet, He doesn’t leave it at that.
God takes sin so seriously that He did something about it. In fact, we see by what He did just how serious He really is: He gave His only Son for us, handing Him over to be crucified and killed. That's what our sin required, and out of His great love and deep compassion *that* is the price He paid - for us and for all people. That’s how the Holy Triune God deals with sinners (like us) . . . with mercy and forgiveness - and that is how we, too, as forgiven sinners, must deal with each other: taking sin seriously, to be sure, but confronting it on the basis of the Gospel of forgiveness above all else.
So it is that we do not understand our Gospel this morning correctly, if we do not understand that mercy and forgiveness (and reconciliation between Christians) is the ultimate goal and objective in these words of our Lord: “If your brother sins against you, go and tell him his fault between you and him alone. If he hears you, you have gained your brother.”
If a fellow believer sins, it *is* against you because you are a member of the same body. Therefore, you have a responsibility to show him his sin. But notice how our Lord is concerned to protect the reputation of His children. If you witness a brother’s sin, you must go to him personally and alone to confront him with it. You are not free to tell others about it, not even the pastor. You are not free to gossip, for that too is a sin and hurts the body. You must keep it to yourself until you have talked to the offending party yourself.
And as you talk to that person, do not think more highly of yourself than you ought (Rom. 12:3). Remember that you too are a sinner, and that just as you would want a friend to tell you if you have food stuck in your teeth or that your shirt is mis-buttoned, you would want him to lovingly tell you of your sin. “Speak the truth in love” (Eph. 4:15). When the steps our Lord outlines are applied properly we are like a pickup truck rather than a dump truck. When we point out our brother's sin, it has as its only goal the salvation of our brother. As we confront him with his sin, we don't do it to dump on him, to drive him from the church. Rather we do so in order to pick him up and restore him to the fellowship. Indeed, the best part about all this is when a brother takes the word of correction to heart and repents. We then have opportunity to announce God’s forgiveness to him and assure him of God’s love. In fact, such repentance and forgiveness makes the angels in heaven rejoice.
However, if after repeated attempts the person does not listen but remains unrepentant, Jesus says, “take one or two others along with you, that every word may be confirmed by the evidence of two or three witnesses.” Two or three witnesses is the Old Testament requirement for upholding truth and justice. The two or three act as a jury listening to both sides and rendering judgment. If these witnesses agree that the offending party is guilty, then the offending party is once again urged to repent, confess, and receive holy absolution. If he repents, the matter is settled and the whole affair is contained within a small number of members.
Unfortunately, these matters don’t always end this way. Some people simply refuse to acknowledge their sin and repent of it. For whatever reason, a personal rebuke or even one with two or three involved, is ignored or sloughed off. So Jesus says, “But if he refuses to listen to them, tell it to the church; and if he refuses to listen to the church, treat him as you would a pagan or a tax collector.” If two or three witnesses cannot bring the offending party to repentance, the witnesses testify to the church and the church renders the final verdict.
Even here, the goal is the winning of the brother. Giving the accused a public warning - one last chance to repent - is an act of mercy, designed to save the person from being excluded from the community of believers, and even heaven itself.
But if the person continues to be unrepentant, refuses to turn from his sin, the church must find him guilty and declare that the person’s sins are bound to him and that he is no longer considered a Christian, but an outsider. Yet, even this drastic action has as its goal the proclamation of the free forgiveness of sins. For if the person realizes the seriousness of his sin and takes it to heart and repents, the Church can and must announce that forgiveness. And she will do so with great eagerness and joy.
In the end, even dealing with the unrepentant sinner as though he or she were a "pagan" or a "tax collector" does not mean writing them off forever. It does mean excommunication, to be sure - they are bound in their sin and thus excluded from the Holy Communion of the Church. But this means, also, that they are once again part of that great mission field of those outside the Church.
Thus, even after the painful process of excommunication has taken place (as a preaching of the Law in all its dreadful seriousness), the Church continues to deal with the sinner from the ultimate perspective of mercy and forgiveness (the Gospel of Christ and His Cross). The driving objective of the entire process, from start to finish, it that the sinner repent, turn from his sin, and receive the full and free forgiveness of Christ.
Sad to say, what our Lord teaches in Matthew 18 is probably some of the most forgotten and ignored in all of Scripture. Look how often we deal with each other very differently, in ways that ought to make us ashamed. We add sin upon sin, bring shame to the Name of Christ, and drive wedges into His Church, by our disobedience and by our stubborn refusal to admonish and forgive.
The fact is, that we shall never be able to deal with each other as we should, except in so far as we are in Christ and He is in us. He alone will melt our hearts of stone into compassionate hearts of mercy like His own.
The psalmist says, “Behold, how good and pleasant it is when brothers dwell in unity!” (Ps. 133:1). And St. Paul writes, “So if there is any encouragement in Christ, any incentive of love, any participation in the Spirit, any affection and sympathy, complete my joy by being of the same mind, having the same love, being in full accord and of one mind. Do nothing through strife or conceit, but in humility count others better than yourselves. Let each of you look not only to his own interests, but also to the interests of others.” (Phil. 2:1-4).
Indeed, showing such brotherly love to one another is based on the love and forgiveness shown and given to us by Christ. By His Cross and Passion, He has reconciled you (and all the world) to God His Father. By His washing of water with the Word in Holy Baptism, He has welcomed you into His Church, has given you His Holy Spirit, and has granted you the right to be called a child of God. Now by His Gospel and the holy Sacrament of the Altar, He holds out to you and gives to you the fruits of His Cross: His forgiveness, His Life, and His Salvation.
So, in spite of our constant failure to deal with sin (and with each other) in the way of Christ, our heavenly Father - for the sake of His Son - continues to come among us with His healing mercy, grace, and forgiveness. God grant that we so know His love in Christ that we treat one another with brotherly love. Amen.
The peace of God, which passes all understanding, keep your hearts and minds through Christ Jesus.