Matthew 5:27–28 is one of the most discussed passages in the Sermon on the Mount because Jesus takes one of the most familiar commandments in Scripture and presses His listeners beyond surface-level obedience. The passage says:
“Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.”
The passage must be read carefully. Jesus is not saying that noticing another person is the same as adultery. He is not treating every passing temptation as identical to the outward act. He is addressing the deliberate direction of the heart toward lustful desire, showing that God’s concern reaches deeper than visible behaviour alone.
Matthew 5 places this teaching within Jesus’ larger explanation of kingdom righteousness. He is not abolishing the Law. He is revealing the depth of what God’s commandments always required.
The Commandment Jesus Quotes
Jesus begins by quoting the Seventh Commandment:
“Thou shalt not commit adultery.”
This command appears in Exodus 20:14 and Deuteronomy 5:18. In its original setting, the command protected the marriage covenant by forbidding sexual unfaithfulness. It affirmed that marriage was not casual, temporary or merely private. It belonged under God’s moral authority.
By quoting this commandment, Jesus begins with something His audience already accepted. They knew adultery was forbidden. The question was whether obedience could be reduced to avoiding the outward act while allowing the inner life to remain unexamined.
Jesus’ teaching shows that the commandment reaches into the heart because adultery does not begin only when an outward act occurs. The outward act is the visible expression of inward desire that has already been welcomed and entertained.
Also Read: Thou Shalt Not Commit Adultery Meaning in the Bible
What “You Have Heard” Means
The phrase “You have heard that it was said” appears several times in Matthew 5. Jesus uses it to engage familiar teachings His listeners had received. He is not attacking Scripture itself. Earlier in the same chapter, He says that He did not come to destroy the Law or the Prophets but to fulfill them.
This means Matthew 5:27–28 should not be read as Jesus correcting a faulty commandment. The commandment was holy and true. Jesus is correcting a shallow way of understanding righteousness that focuses only on external action.
His audience could easily say, “I have not committed adultery,” while ignoring the inner desires that moved against covenant faithfulness. Jesus exposes that gap. He shows that God’s righteousness cannot be measured only by what is publicly visible.
The Pattern in Matthew 5
Matthew 5 contains a repeated pattern. Jesus discusses murder and then addresses anger. He discusses adultery and then addresses lust. He discusses oaths and then addresses truthful speech. In each case, He moves from the external act to the inner condition that gives rise to it.
This pattern matters because it shows that Matthew 5:27–28 is not an isolated moral statement. It belongs to Jesus’ larger teaching about righteousness that exceeds outward legal compliance.
The connection between anger and murder helps clarify the connection between lust and adultery. Jesus does not erase all distinctions between inward attitudes and outward acts. Murder and anger are not identical in every consequence. Adultery and lust are not identical in every consequence. Yet the inward condition is morally significant because it reveals the direction of the heart.
What “Looketh on a Woman to Lust After Her” Means
Jesus’ wording is precise. He does not simply say, “whoever sees a woman.” He speaks of looking “to lust after her.” The phrase describes a look governed by intention. It is not accidental sight. It is not ordinary recognition of beauty. It is a gaze that has become an instrument of desire.
This distinction is necessary because Scripture does not condemn the mere awareness that another person is attractive. The Bible itself describes physical beauty in several narratives. The issue in Matthew 5:28 is not awareness but intentional desire directed toward what does not belong to covenant faithfulness.
The look Jesus describes is morally active. It seeks, entertains and welcomes lust. It is not a passing temptation immediately resisted. It is desire being cultivated in the inner life.
Lust and the Direction of the Heart
The word translated “lust” refers to desire or longing and context determines whether that desire is right or sinful. In Matthew 5:28, the desire is clearly sinful because it is directed toward adultery in the heart.
Jesus is not merely regulating outward conduct. He is identifying the inward movement that makes outward sin possible. A person may avoid the visible act while inwardly giving consent to desires that oppose faithfulness.
This is why the heart is central to the passage. In biblical thought, the heart is not only the seat of emotion. It includes desire, intention, thought, will and moral direction. When Jesus speaks of adultery in the heart, He is speaking about the inward person before God.
Also Read: Lasciviousness in the New Testament Explained
“Already Committed Adultery With Her in His Heart”
The phrase “already committed adultery with her in his heart” is the centre of the passage. Jesus is teaching that lustful intention has moral significance before God even when it remains hidden from others.
This does not mean that inward lust and outward adultery are identical in every respect. Outward actions have consequences that inward desires may not produce in the same way. Scripture continues to recognize differences between temptation, desire, intention and completed action.
However, Jesus refuses to let the inner life be treated as morally neutral. A person who deliberately looks with lust has already crossed a boundary in the heart. The person may appear outwardly obedient but inwardly the covenant faithfulness protected by the commandment has already been violated.
Also Read: Fornication Meaning Explained Biblically
Difference Between Temptation and Entertained Desire
Matthew 5:27–28 should not be used to confuse temptation with deliberate sin. Temptation can confront a person without being welcomed. Jesus Himself was tempted, yet without sin. The moral issue in Matthew 5:28 is not the arrival of temptation but the willing participation of the heart.
A passing thought resisted is different from a desire intentionally cultivated. A moment of awareness is different from a gaze chosen for lust. Jesus is addressing the latter.
This distinction is important because it protects the passage from careless interpretation. Jesus is not burdening His hearers with guilt for every involuntary thought. He is exposing the danger of allowing desire to become an inward act of unfaithfulness.
Why Jesus Moves From Action to Intention
Jesus moves from outward action to inward intention because the Sermon on the Mount is concerned with true righteousness before God. Human judgment often stops at visible behaviour because people can only see the outside. God sees the heart.
This does not make outward obedience unimportant. Jesus does not minimize the commandment. Instead, He shows that outward obedience without inward faithfulness is incomplete.
A person may avoid adultery in public while privately nurturing desires that contradict the very faithfulness the commandment was given to protect. Jesus’ teaching closes that gap by bringing the inner life under God’s authority.
The Heart as the Source of Moral Life
The Bible repeatedly presents the heart as the source from which actions proceed. Jesus teaches elsewhere that evil thoughts, adultery, sexual immorality and other sins come from within the heart. This wider biblical teaching helps explain Matthew 5:27–28.
The heart is where desires are received, entertained, resisted or cultivated. It is where intention takes shape before action becomes visible. Jesus therefore addresses adultery at the level of the heart because that is where unfaithfulness begins to form.
This makes His teaching more searching than a simple external rule. He is not only asking whether the act has occurred. He is asking what the heart has chosen to desire.
Heart Righteousness in the Sermon on the Mount
Matthew 5:27–28 belongs to Jesus’ teaching that righteousness must exceed the righteousness of the scribes and Pharisees. That does not mean more religious performance. It means a deeper righteousness that reaches the whole person.
The Sermon on the Mount repeatedly challenges outward religion that leaves the heart untouched. Jesus speaks about anger, lust, truthfulness, retaliation, love for enemies, prayer, fasting, giving and devotion to God. In each area, He shows that the inner person matters.
Adultery in the heart fits this pattern. Jesus is not creating a new sin category detached from the Seventh Commandment. He is showing the full moral depth of the commandment by addressing the desires that undermine faithfulness before they become outward acts.
What Matthew 5:27–28 Teaches About Adultery
Matthew 5:27–28 teaches that adultery is not only an external violation of marriage but also a matter of inward unfaithfulness. The physical act remains serious but Jesus shows that God’s concern includes the desires and intentions that move the heart toward that act.
This teaching does not erase the difference between thought and action. It does not say that every temptation is the same as adultery. It does say that intentional lustful looking is morally serious because it reveals a heart moving against covenant faithfulness.
Jesus therefore deepens the commandment by showing that true obedience must include the inner life.
Also Read: Sexual Immorality in the Bible
Matthew 5:27–28 Explained
“Adultery in the heart” means deliberate lustful desire that violates the faithfulness protected by the Seventh Commandment. Jesus quotes the commandment against adultery and then reveals that obedience cannot be reduced to avoiding the outward act while entertaining inward unfaithfulness.
The passage calls readers to understand righteousness at the level of the heart. God sees not only public behaviour but also desire, intention and moral direction. Matthew 5:27–28 therefore teaches that faithfulness before God includes both outward conduct and inward purity.
