What Jesus Really Meant by Adultery in the Heart in Matthew 5:28

Matthew 5:28 is often interpreted as though merely looking at someone with physical or romantic attraction means adultery has already been committed in the heart. That interpretation creates serious problems when tested against the whole biblical record.

God created male and female, created their capacity to be drawn toward one another, established marriage, and declared His creation “very good.” Jesus cannot be interpreted in a way that turns God’s original design for men and women into unavoidable sin.

Jesus Begins With the Seventh Commandment

Jesus does not begin with a general statement about attraction between men and women. He identifies exactly which commandment He is addressing.

“Ye have heard that it was said, Thou shalt not commit adultery:” — Matthew 5:27 ASV

Jesus is quoting the seventh commandment:

“Thou shalt not commit adultery.” — Exodus 20:14 ASV

That matters because adultery already had an established meaning. It concerns the violation of an existing marriage covenant.

Jesus then continues:

“but I say unto you, that every one that looketh on a woman to lust after her hath committed adultery with her already in his heart.” — Matthew 5:28 ASV

Jesus does not change subjects between verses 27 and 28. He takes the adultery prohibited by the seventh commandment and reveals where that adultery begins before the physical act occurs.

The Greek Must Be Read With the Whole Biblical Record

Three Greek words and one important grammatical construction stand at the center of Matthew 5:28. Taken together with the Greek Old Testament and the biblical meaning of adultery, they form a much stronger picture than the English word “lust” by itself conveys.

G1135 — Gynē: Woman or Wife

The Greek word γυνή — gynē, appearing in Matthew 5:28 as gynaika, can mean either woman or wife. The word therefore does not settle its meaning by itself; the context must tell us which sense is intended.

Jesus has already supplied that context: adultery.

A few verses later Matthew uses the same Greek word unmistakably for a wife:

“It was said also, Whosoever shall put away his wife, let him give her a writing of divorcement:” — Matthew 5:31 ASV

The word translated wife is again gynē. Nothing about the Greek word itself requires the broader meaning “woman” when the context establishes marriage.

The same thing occurs in the Greek Old Testament. Exodus 20:17 uses gynaika specifically for your neighbor’s wife:

“Thou shalt not covet thy neighbor’s wife.” — Exodus 20:17 ASV

This becomes especially important because Matthew 5:28 and Exodus 20:17 share more than the word gynaika.

They also share the same Greek verb for desiring or coveting.

G1937 — Epithymeō: Desire, Covet, Lust After

The Greek verb ἐπιθυμέω — epithymeō means to desire, long for, covet, or lust after. The word itself does not mean that every spontaneous response to beauty or every desire between a man and woman is sinful.

Its moral character depends upon what is being desired and whether that desire is lawful or forbidden.

Now compare Matthew 5:28 with the Greek Old Testament command concerning another man’s wife.

Exodus 20:17 contains:

οὐκ ἐπιθυμήσεις τὴν γυναῖκα τοῦ πλησίον σου

The key words are:

• epithymēseis — you shall not covet or desire;
• gynaika — wife;
• tou plēsion sou — of your neighbor.

Centuries before Jesus spoke Matthew 5:28, the Greek Scriptures had already joined epithymeō and gynaika in the command against coveting another man’s wife.

Matthew 5:28 again joins these same two Greek words while explicitly discussing adultery. That correspondence deserves considerable weight.

“To Lust After Her” Expresses Directed Intent

Matthew 5:28 does not merely say that a man sees someone and experiences a reaction. The Greek construction is:

πρὸς τὸ ἐπιθυμῆσαι αὐτήν — pros to epithymēsai autēn

The construction pros to followed by the infinitive naturally expresses direction or purpose: looking with a view toward desiring or coveting her.

That is substantially different from seeing someone attractive and having an involuntary response. Jesus describes a look that is being directed toward desire.

The heart is no longer merely encountering temptation. It is beginning to participate in it.

G3431 — Moicheuō: To Commit Adultery

Then comes the word that governs the entire statement.

The Greek verb μοιχεύω — moicheuō, appearing in Matthew 5:28 as emoicheusen, means to commit adultery.

Jesus does not use a general word for attraction. He does not identify merely noticing beauty as adultery, nor does He use a general category meaning every form of improper sexual thought.

He specifically says adultery.

That is decisive because adultery concerns the violation of a marriage covenant. The word carries the discussion back to the seventh commandment Jesus has just quoted.

The Three Greek Words Converge

The argument should therefore be followed as a whole:

• Matthew 5:27 establishes the subject: adultery.
• Moicheuō identifies the offense specifically as adultery.
• Gynē / gynaika can mean wife.
• Epithymeō can mean covet or desire.
• Pros to epithymēsai describes looking with a view toward that desire.
• Exodus 20:17 in Greek already joins gynaika and epithymeō concerning a neighbor’s wife.
• The entire biblical record consistently treats adultery as violation of a marriage covenant.

Those lines of evidence converge.

The contextually appropriate sense of gynaika in Matthew 5:28 is therefore wife, and the desire Jesus condemns is not involuntary attraction. It is the deliberate inward coveting of what is forbidden within another marriage covenant.

An Interpretive Rendering of Matthew 5:28

Because modern English readers can hear “woman” as meaning every woman whatsoever, the marriage context can disappear from the verse.

An interpretive rendering that makes the biblical meaning explicit would read:

“But I say unto you that everyone who looks upon a wife with lustful intent toward forbidden sexual relations with her has already committed adultery with her in his heart.”

This does not create a new meaning for Jesus’ statement. It makes explicit the marriage-covenant meaning established by the word adultery, the available meaning of gynaika, the meaning of epithymeō, the purpose expressed by pros to epithymēsai, and the testimony of the rest of Scripture.

David Shows What Jesus Was Talking About

God gives us a powerful Old Testament picture of the very process Jesus describes. David and Bathsheba show how adultery develops from the heart into outward action.

David first saw Bathsheba:

“and from the roof he saw a woman bathing; and the woman was very beautiful to look upon.” — 2 Samuel 11:2 ASV

Scripture does not identify the sight of her beauty as David’s adultery. He saw a beautiful woman.

David then inquired about her and received crucial information:

“Is not this Bath-sheba, the daughter of Eliam, the wife of Uriah the Hittite?” — 2 Samuel 11:3 ASV

Now David knew exactly where the boundary stood. She was another man’s wife.

At that point David could have rejected the desire and gone no further. Instead, he embraced it and began pursuing what he knew was forbidden.

The progression is unmistakable:

• David saw a beautiful woman.
• He inquired about her.
• He learned that she was Uriah’s wife.
• He did not reject the forbidden desire.
• He deliberately pursued what was forbidden.
• The inward adultery became physical adultery.

Jesus reaches into that progression and identifies adultery before the physical act. David’s body eventually carried out what his heart had already accepted.

Joseph Shows the Opposite Response

Joseph provides the opposite picture.

Potiphar’s wife directly attempted to draw Joseph into sexual relations. Joseph understood that she belonged within another man’s marriage covenant.

“because thou art his wife: how then can I do this great wickedness, and sin against God?” — Genesis 39:9 ASV

Joseph refused her and eventually fled.

Temptation was present, and opportunity was present. But Joseph did not embrace the forbidden desire and pursue it.

David and Joseph therefore give us two remarkably clear pictures.

David encountered forbidden desire and pursued it. Joseph encountered forbidden temptation and rejected it.

Temptation Is Not Sin

The New Testament confirms that distinction through Christ Himself.

“but one that hath been in all points tempted like as we are, yet without sin.” — Hebrews 4:15 ASV

If the mere experience of temptation were itself sin, Christ could not have been tempted without sinning.

The same distinction must therefore be preserved in Matthew 5:28. A spontaneous awareness of beauty, an involuntary physical response, or temptation is not identical to deliberately accepting and cultivating forbidden desire.

The bird may fly overhead. The sin begins when the heart allows it to build a nest.

Proverbs Already Described the Same Heart Problem

Long before the Sermon on the Mount, Proverbs connected beauty, inward desire, and another man’s wife.

“Lust not after her beauty in thy heart; Neither let her take thee with her eyelids.” — Proverbs 6:25 ASV

The passage identifies the relationship in view:

“So he that goeth in to his neighbor’s wife; Whosoever toucheth her shall not be unpunished.” — Proverbs 6:29 ASV

Notice what Scripture does not say. It does not say that seeing beauty is adultery.

The warning concerns allowing desire for another man’s wife to establish itself within the heart. Jesus is not creating a new moral category in Matthew 5:28; He is exposing the inward root of the same sin Scripture had already revealed.

God Created Attraction Between Men and Women

Before there was adultery, before there was human sin, and before there was a fallen world, God created male and female.

“And God created man in his own image, in the image of God created he him; male and female created he them.” — Genesis 1:27 ASV

God then said:

“It is not good that the man should be alone; I will make him a help meet for him.” — Genesis 2:18 ASV

The male-female relationship was God’s design.

Marriage was God’s design.

The natural attraction that draws men and women toward relationship and marriage cannot therefore be treated as though its mere existence constitutes adultery. Otherwise God would have created a path toward marriage that first required people to violate the seventh commandment.

Scripture gives us no such contradiction.

Scripture Allows Desire to Move Toward Marriage

Paul’s instruction to unmarried believers makes this especially clear.

“But if they have not continency, let them marry: for it is better to marry than to burn.” — 1 Corinthians 7:9 ASV

Paul does not tell unmarried believers that the desire drawing them toward marriage has already made them adulterers. He directs that desire toward the lawful relationship God created—marriage.

This passage becomes extremely difficult to reconcile with the claim that being physically drawn toward an unmarried potential spouse is already adultery of the heart. Scripture instead distinguishes between desire that can lawfully move toward marriage and forbidden desire that violates an existing marriage covenant.

What Matthew 5:28 Does Not Condemn

Jesus’ words should not be expanded beyond what Scripture establishes.

Matthew 5:28 does not identify the following things as adultery:

• noticing that another person is physically attractive;
• experiencing an involuntary response to beauty;
• feeling physical or romantic attraction toward an unmarried potential spouse;
• desiring a husband or wife;
• pursuing an honorable relationship leading toward marriage;
• experiencing temptation and refusing it;
• immediately rejecting attraction toward someone who is married.

A single person can certainly participate in adultery by deliberately pursuing someone else’s husband or wife. The determining issue is not simply whether the person experiencing the desire is married or single.

The issue is the marriage covenant being violated.

Where Adultery of the Heart Actually Begins

A man may encounter a married woman whom he finds extremely beautiful. An immediate response may arise before he has consciously chosen anything.

That is where the distinction becomes critical.

He can reject the desire, refuse to cultivate it, and turn away. By the Spirit he can put the forbidden desire to death rather than allowing it to find a home within his heart.

Or he can welcome it.

He can begin imagining, cultivating, desiring, and inwardly pursuing what he knows is forbidden. His heart can reach the place where, given the opportunity, he would willingly take what belongs within another marriage covenant.

That is the territory Jesus is exposing.

The physical act has not yet happened, but the heart has already consented to the adultery. The outward act, if it follows, simply reveals what the heart had already chosen.

A Harmful False Teaching

The teaching that ordinary physical or romantic attraction toward any person, including an unmarried potential spouse, constitutes adultery in the heart does not survive examination against the whole biblical record.

It collapses biblical categories that Scripture keeps distinct:

• attraction becomes adultery;
• temptation becomes sin;
• desire becomes automatically forbidden;
• marriage is removed from the definition of adultery;
• and the attraction God created to draw men and women toward marriage becomes morally suspect.

That is not what Jesus taught.

The seventh commandment protects marriage. Matthew 5:28 strengthens that protection by reaching into the heart before the physical violation occurs.

The Harm Done to Single Believers

This misunderstanding can be especially harmful to single Christians.

A believer may sincerely desire a husband or wife yet become afraid that noticing someone’s beauty, feeling drawn toward that person, or developing romantic interest means a serious sexual sin has already been committed.

That fear can interfere with the very relationships God created men and women to form.

Healthy courtship ordinarily involves attraction. Marriage often begins because two people become drawn toward one another physically, emotionally, relationally, and spiritually.

Christ did not establish a standard requiring unmarried believers to suppress every natural awareness of the opposite sex until the moment they marry. Scripture never places that burden upon them.

Single believers are free to meet one another, experience attraction, develop affection, pursue an honorable relationship, and seek marriage without living under the accusation that they are committing adultery merely because they are drawn toward one another.

Jesus Could Not Redefine His Father’s Commandment

After all of these lines of Scripture have converged, one final issue closes the remaining door.

Jesus repeatedly testified that He did not act independently of His Father.

“The Son can do nothing of himself, but what he seeth the Father doing: for what things soever he doeth, these the Son also doeth in like manner.” — John 5:19 ASV

He said again:

“I can of myself do nothing: as I hear, I judge: and my judgment is righteous; because I seek not mine own will, but the will of him that sent me.” — John 5:30 ASV

Jesus therefore could not take a commandment established by the Father and independently change its meaning. To set His own will against the Father’s word would have been disobedience.

That would have had consequences far greater than a disagreement over interpretation.

Jesus had to remain completely without sin in order to go to the cross as the spotless Lamb.

“but one that hath been in all points tempted like as we are, yet without sin.” — Hebrews 4:15 ASV

Peter describes Him as:

“precious blood, as of a lamb without blemish and without spot, even the blood of Christ.” — 1 Peter 1:19 ASV

If Jesus had knowingly altered the Father’s righteous command according to His own independent will, He would Himself have sinned. He would no longer have been the spotless sacrifice qualified to bear the sins of others.

Why Satan’s Temptation of Jesus Matters

This helps explain the importance of Satan’s temptation of Jesus in the wilderness.

The enemy repeatedly attempted to move Jesus to act outside the path established by His Father—to turn stones into bread at Satan’s suggestion, to cast Himself from the temple and force God’s intervention, and to receive the kingdoms of the world through another route.

Jesus refused every attempt.

“Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.” — Matthew 4:4 ASV

That answer reveals the principle governing Christ’s entire earthly walk. He lived by the word and will of His Father.

The same Jesus who refused Satan’s attempts to move Him outside the Father’s will did not later stand on the mountain and independently rewrite one of His Father’s commandments.

He revealed its inward reach.

The Seventh Commandment Written Upon the Heart

God had already promised exactly this movement inward under the New Covenant:

“I will put my law in their inward parts, and in their heart will I write it.” — Jeremiah 31:33 ASV

God said He would write His law upon the heart. He did not say He would write a revised version carrying a different definition.

Matthew 5:28 becomes remarkably clear when Scripture is allowed to interpret Scripture.

Jesus begins with the seventh commandment:

“Thou shalt not commit adultery.”

He does not redefine it.

He reveals where its violation begins.

David shows us forbidden desire accepted and pursued.

Joseph shows us forbidden temptation rejected.

Proverbs warns against lusting after another man’s wife in the heart.

Exodus 20:17 in Greek joins gynaika with epithymeō in the command against coveting a neighbor’s wife.

Matthew 5:28 joins those same words to moicheuō—adultery and describes a look directed toward that forbidden desire.

Genesis preserves God’s good design for male and female.

Paul shows that desire among unmarried believers can lawfully move toward marriage.

Christ’s perfect obedience confirms that He could not independently revise His Father’s commandment and still remain the spotless Lamb qualified for the cross.

And the New Covenant promise explains the inward direction of Jesus’ teaching: God writes His law upon the heart.

Matthew 5:28 therefore does not condemn people for seeking love.

It warns us that adultery does not suddenly begin when two bodies meet. It begins when the heart knowingly embraces and pursues forbidden desire toward what belongs within another marriage covenant.

That is not a revised seventh commandment.

It is the seventh commandment written upon the heart.