Short answer: Matthew 18:15–17 records Jesus telling a disciple who has been sinned against to go and show the offender his fault privately, with the goal of gaining him back. Only if that private word is refused does the circle widen, first to one or two witnesses and then to the assembly. The passage authorizes an honest confrontation and sets its order, audience and aim, but it never promises the spouse will listen and never makes the offended person responsible for the other's repentance.
The setting of Matthew 18:15-17: a rescue mission, not a tribunal
Matthew 18:15–17 comes from the fourth of the five large teaching blocks in Matthew's Gospel, where Jesus instructs his disciples about life together in his community. The passage is procedural and stepwise: a private conversation, then one or two witnesses, then the assembly, then a final boundary. But the steps do not begin the unit. Just before them stands the parable of the lost sheep, and its closing line sets the tone: "Even so it is not the will of your Father who is in heaven that one of these little ones should perish" (Matthew 18:14). The procedure that follows is framed as a search for the one who has gone astray.
The surrounding chapter matters too. Jesus has just warned about causing little ones to stumble, and after these verses he speaks of binding and releasing and of two or three agreeing in prayer. So the whole instruction sits inside a chapter about a praying, gathered community that takes the weak and the wandering seriously. The requirement of one or two witnesses echoes Israel's older covenant pattern for establishing a matter, which means Jesus is not inventing a private grievance system. He is giving his disciples a shaped way to pursue a brother who has sinned, with the goal of gaining him back rather than winning a case.
These are instructions from Jesus to his disciples, presented in Matthew as his own authoritative teaching, not as an optional suggestion. Yet the setting keeps the purpose clear. The steps aim at restoration: the private conversation seeks to gain the brother, and the witnesses serve to establish the matter, not to multiply accusers. That context matters enormously when the sin in view is an affair. The passage gives a path toward honest, calm conversation, but it is not a license to corner someone. Where there is threat, coercion, or harm, the pursuit of the wandering one must be accompanied by wise pastoral and civil counsel, never by pressure to face danger alone.
What Jesus actually says about confronting a wrong
The setting matters. Jesus has just finished the parable of the lost sheep and the shepherd who rejoices over the one he finds (18:12–14), and the very next words turn that mercy toward a brother who has sinned. The instruction is not vague hinting. The phrase translated "show him his fault" carries the sense of exposing and convicting, naming the wrong plainly so the other person can see it. In a marriage after an affair, that means the betrayed spouse is not asked to drop hints or manage appearances. The text calls for a clear, honest naming of what happened, spoken to the person who did it.
The next phrase sets a strict limit on audience: "between you and him alone." Before anything is told to children, friends, or a church group, the matter belongs to the two people involved. That is why a confrontation staged in front of others departs from what Jesus describes. The goal is equally specific. "You have gained back your brother" frames the outcome in relational terms, recovery rather than victory. The point of the conversation is to win the person back, not to build a case or secure an apology. Notice too that the passage assumes the wrongdoer may not listen, and it gives a next step rather than demanding instant results.
Only after private conversation fails does the circle widen, first to one or two witnesses, then to the assembly. The phrase "as a Gentile or a tax collector" describes a changed standing in the community, not a license for contempt; the same Jesus eats with tax collectors elsewhere. One caution belongs here. This passage should never be used to pressure someone to confront an abusive or dangerous spouse alone. Where there are threats, coercion, or harm, wise pastoral and civil counsel should accompany every step, and safety comes before a private meeting.
Go first, and go to gain your brother back
Jesus does not leave the offended person to simmer. In Matthew 18:15 he says to go, to show the fault privately, and he names the aim: gaining the brother back. Read that against the parable just before it. The shepherd leaves the ninety-nine and rejoices when he finds the one, because the Father does not will that one of these little ones perish (18:13–14). The private conversation is framed as a rescue, not a courtroom. The goal is restoration of the person, which means the first conversation is not primarily a case being built or a verdict being announced.
The order that follows is deliberate. If the private word is refused, Jesus says to take one or two more, so that every word may be established by witnesses (18:16). That echoes the older covenant pattern where testimony required more than one voice. Only after that does the matter go to the assembly (18:17). Notice what the passage does not do. It does not promise the spouse will listen, and it does not make the offended person responsible for the other's repentance. The widening steps exist because refusal is a real possibility, and the process has a shape that protects both parties from rumor and from endless private stalemate.
The verses that follow keep this instruction inside a praying community. Jesus speaks of binding and releasing (18:18) and of two agreeing in prayer (18:19), so the confrontation is not a private grudge match but the life of a gathered church that prays. Matthew presents all of it as Jesus' own authority, not advice. One caution belongs here: this passage should never be used to send someone alone into an abusive or dangerous situation. Where there are threats, coercion, or harm, wise pastoral and civil counsel should accompany the steps, and safety comes before a private meeting.
Where careful readers differ on Matthew 18:15-17
The steps themselves are plain. A wrong is named privately first, then before one or two witnesses, then before the assembly. What the fourth step means is disputed. Some readers hear formal exclusion from the church in the phrase about a Gentile or tax collector. Others hear a change in ordinary social closeness rather than a verdict on the person's standing before God. Still others notice how Jesus treated Gentiles and tax collectors elsewhere and read the line as a posture of continued mission. Readers also differ over whether these verses govern private interpersonal sin only or formal church discipline as well. What stays central is that the wrong is named and the audience is kept as small as faithfulness allows.
A second disagreement concerns sequence and scope. Some hold that the steps must be followed in strict order in every case. Others observe that the text simply assumes the offender will not listen; it does not address danger, coercion, or ongoing deception. The parallel instruction in Luke about forgiving a repentant brother presses the question of what happens when the offender does listen, which this passage does not spell out. Readers also differ over how directly this applies to a marriage, since the text speaks of a brother and of the assembly rather than of a spouse. Across these readings, the aim named is gaining back the brother, not winning an argument.
What limits the text itself sets matter here. These verses describe a process for naming wrong and pursuing restoration within the church under Christ's authority, not a warrant for private vengeance or for cornering someone alone. They never require a person in danger to confront an abusive spouse by themselves. Where there are threats, coercion, or harm, wise pastoral and civil counsel should accompany any step taken, and safety is not unbelief. The central thread across faithful readings is plain: name the wrong, keep the circle small, aim at restoration, and leave the outcome to the Lord who does not will that one of these little ones should perish.
The pursuit of a brother in Matthew 18
Matthew 18:15–17 sits on the far side of a parable about a shepherd who leaves ninety-nine sheep to search for one that has wandered. Jesus says of that shepherd, "If he finds it, most certainly I tell you, he rejoices over it more than over the ninety-nine which have not gone astray." He then draws the point plainly in 18:14, that the Father does not will for one of these little ones to perish. The instruction that follows is not a procedure for winning arguments. It is the shape the shepherd's search takes inside a community of people who know they have also been sought.
Notice the direction of the movement. The offended person goes, and the first conversation stays private, between the two of them alone. Only if that is refused does the circle widen, first to one or two witnesses, then to the assembly. The goal named is not winning but gaining a brother back. That pattern runs against the instinct to wait for the offender to come and apologize first. God in Christ did not wait; he pursued people who had gone astray. Yet the text is honest about refusal. Jesus builds in the possibility that every stage will be rejected, so no one should read this as a promise that confrontation will succeed.
This passage should never be used to send someone alone into danger. Where there are threats, coercion or harm, the private first step is not the wise one, and pastoral and civil counsel should accompany the situation. For ordinary sin between two believers, the passage calls for a calm, private conversation that aims at restoration, not at a verdict. Jesus speaks of his own authority being present where two or three gather in his name, and he gives these instructions to people who will need the same forgiveness they are extending. Grace comes first: we go to a brother because we ourselves were sought and found.
The final step, treating the unrepentant person as a Gentile or tax collector, sounds harsh until we remember how Jesus treated Gentiles and tax collectors. He ate with them and called them to himself. So even the last stage is not permission to despise someone. It is a recognition that the relationship has changed, held alongside the Father's stated will that none of these little ones perish. The community that confronts is the same community that prays for the one who has not yet listened.
Practically, this shapes how a couple speaks after an affair. The offended spouse is not handed a weapon but a path: speak the truth privately, bring trusted witnesses if needed, and keep the goal of gaining the brother in view. The offender is not the enemy to be crushed but the one sheep being sought. Nothing here guarantees the outcome, and refusal is a real possibility the Lord himself anticipated. What is promised is that the Shepherd's heart stands behind the search, and that he is present when his people gather in his name to seek the lost.
The passage ends with a striking promise: where two or three agree in asking, the Father answers. That promise belongs to a community gathered around the name of Jesus, not to two people negotiating a private settlement. It is a reason for a couple to pray together and with others rather than to treat the process as a contest. The confrontation described is surrounded by prayer, by witnesses, and by the presence of Christ himself. That is the atmosphere in which a marriage can be addressed after betrayal: truth spoken calmly, restoration as the aim, and dependence on the one who came to seek and save the lost.
What faithful response looks like when trust has been broken
Jesus sets the direction in Matthew 18:15: go to your brother and show him his fault privately, between the two of you. The order matters. He does not begin with a public verdict or a group intervention, but with a private conversation that leaves room for repentance. Before you speak, write down what you actually want from the conversation. If the aim is to win, the words will come out as a sentence pronounced on your spouse. If the aim is truth spoken plainly and a hearing that could lead to change, the words can stay calm. Keep children and friends out of that first conversation.
Prepare the substance, not just the feelings. Name the wrong concretely and without exaggeration, and decide in advance where you will stop talking and listen. Matthew 18:16–17 describes what happens when private words are refused: bring one or two witnesses, then tell the assembly. That sequence is Jesus' provision for a refusal, not a threat to hold over your spouse. One safeguard matters here: this passage must never be used to send someone alone into a dangerous or abusive confrontation. Where there are threats, coercion, or harm, bring wise pastoral and civil counsel alongside you before any such conversation.
Grace is the ground you stand on before you take a single step, not a reward waiting at the end of a good conversation. The outcome rests with God, not with how well you frame your words. So use the steadying help of wise believers for your own safety and clarity, and let the church's leaders carry the weight with you when private words are refused. Matthew 18:14 says it is not the will of your Father in heaven that one of these little ones should perish. That is the heart behind every step Jesus names here.
Before speaking, decide the aim in advance and write it down: the goal is a truthful, private conversation that leaves room for repentance, not a verdict delivered. Choose the smallest faithful audience, which normally means speaking to the spouse alone first, and keep children and friends out of the first conversation. Prepare what you will actually say about the wrong, plainly and without exaggeration, and prepare also to stop talking and listen. Bring the matter to the church's leaders when private words are refused, not as a threat but as the next step Jesus named, and use the support of wise believers for your own safety and steadiness along the way. Grace is the ground of this obedience, not the reward for it, and the outcome of the conversation rests with God rather than with your skill in framing it.
Biblical fidelity check
Matthew 18:15–17 was read as a process with a stated goal, not a slogan. The risks are real: treating the three steps as a formula that guarantees a spouse's repentance, or lifting 18:15 alone while ignoring the assembly and the authority in 18:18–19. The text assumes the offender may refuse to listen, and it never addresses danger, coercion, or ongoing deception. It speaks of a brother and the assembly, not a spouse, so applying it to marriage requires care rather than a direct transfer.
The genuine disagreement concerns what treating someone as a Gentile or tax collector means: formal exclusion, reduced social intimacy, or continued mission, since Jesus eats with tax collectors. Readers also differ on whether this governs private sin only or formal church discipline, and how it relates to Jesus' instruction to forgive a repentant brother. What stays central is that the wrong is named plainly, the audience stays as small as faithfulness allows, restoration is the aim, and the process belongs to the church under Christ, not private vengeance.
Other passages that speak to Matthew 18:15-17
For further study, see Handling Sin: Honest Confession and Real Forgiveness on the parable of the lost sheep that opens this chapter, Matthew 2:23 Explained: Why Jesus Was Called a Nazarene on what Jesus says about binding and releasing in 18:18, Matthew 27:9-10: Why Matthew Says Jeremiah Not Zechariah on forgiveness and limits in the verses that follow, and Matthew 7:21-23: Not Everyone Who Says Lord, Lord on how the wider New Testament handles restoration after serious sin.
Frequently asked questions
Does Matthew 18 require me to confront my spouse alone before telling anyone else about the affair?
Matthew 18:15 does direct the offended disciple to go first and speak privately, and that order is real, not optional advice. But the same passage assumes a conversation that is safe to have, and it never asks anyone to walk into danger or coercion alone. If there are threats, intimidation or harm in your situation, get wise pastoral and civil counsel before any confrontation, and treat safety as the first question rather than a later one.
What does it mean to treat an unrepentant spouse as a Gentile or tax collector?
In Matthew 18:17 Jesus says that if the person refuses to hear even the assembly, let him be to you as a Gentile or a tax collector. In its setting this means the relationship is no longer treated as ordinary covenant fellowship; the offender is placed outside the circle rather than simply excused. It is a sober last step after private words and witnesses have been refused, not a first move, and it describes a change in standing rather than permission for cruelty or revenge.
How is church discipline supposed to work when the sin is adultery?
Matthew 18:15–17 gives the shape: private conversation first, then one or two witnesses, then the assembly, with the aim of gaining the person back rather than shaming them. Adultery is serious enough to require honest dealing, and the passage keeps the circle as small as possible for as long as possible. The goal throughout is restoration, and the outcome is not guaranteed, because the offender may refuse to listen at any stage.
