Adultery Meaning in the Bible: A Complete Biblical Guide

Adultery in the Bible means sexual unfaithfulness that breaks the marriage covenant. 

It is voluntary sexual union between a married person and someone who is not their spouse. Scripture treats it as a serious sin against God, against one’s spouse, and against the sacred covenant of marriage.

This article walks through what the Bible actually says about adultery  its Hebrew and Greek roots, its place in the Ten Commandments, how Jesus deepened its meaning, and why the prophets also used it as a picture of spiritual unfaithfulness to God. 

You’re studying this word for personal growth, preparing a sermon, or simply trying to understand a verse you read, you’ll find clear, honest answers here.

Quick Reference Table

Aspect	Summary
Basic meaning	Sexual unfaithfulness by a married person outside the marriage covenant
Hebrew word	na’aph (נָאַף)
Greek word	moicheia / moicheuo (μοιχεία / μοιχεύω)
Key command	You shall not commit adultery (Exodus 20:14)
Old Testament penalty	Death for both parties under Mosaic Law (Leviticus 20:10)
Jesus’ teaching	Adultery begins in the heart, not just the act (Matthew 5:27-28)
Spiritual meaning	Symbol of Israel’s unfaithfulness to God through idolatry
New Testament hope	Forgiveness and restoration are offered through Christ (John 8:11; 1 Corinthians 6:11)

Biblical Meaning of Adultery

In the Bible, adultery is not just a moral failure. It is a covenant violation. Marriage in Scripture is pictured as a binding covenant before God (Malachi 2:14), not merely a legal contract. When either spouse has sexual relations with someone outside that marriage, they break a promise made to their spouse and to God.

The Bible distinguishes adultery from other sexual sins. Adultery specifically involves at least one married person. Other terms, like fornication or sexual immorality (Greek: porneia), cover a broader range of sexual sin, including sex outside of marriage between unmarried people. Adultery is more specific  it always involves the breaking of an existing marriage vow.

Hebrew and Greek Meaning

Hebrew: na’aph (נָאַף)

This is the verb used in Exodus 20:14, You shall not commit adultery. It refers specifically to sexual relations involving a married person outside their marriage. Old Testament law treated this as a serious offense against the community, not just a private matter, because it threatened family lines, inheritance, and social trust.

Greek: moicheia / moicheuo (μοιχεία / μοιχεύω)

The New Testament uses this word group in passages like Matthew 5:27-28 and Matthew 19:9. Jesus uses the verb form to describe both the physical act and, importantly, the inner desire that leads to it. This is a key shift  Jesus doesn’t just repeat the Old Testament command. He explains what it means at its root.

Biblical Context: Adultery in the Law and the Prophets

Adultery appears as one of the Ten Commandments in Exodus 20:14 and Deuteronomy 5:18. It sits among commands about theft, murder, and false witness  sins that damage relationships and community trust.

Under the Mosaic Law, adultery carried the death penalty for both the man and woman involved (Leviticus 20:10, Deuteronomy 22:22). This reflects how seriously ancient Israel viewed the marriage covenant. It wasn’t treated as a private failing but as a sin that damaged the whole community’s trust and stability.

The prophets took this idea further. Hosea, Jeremiah, and Ezekiel used the picture of adultery to describe Israel’s unfaithfulness to God. When the nation worshiped other gods, the prophets called it adultery or harlotry against the Lord, their true covenant partner. This wasn’t a separate meaning of the word  it was the same concept of covenant-breaking applied to Israel’s relationship with God.

Bible Verses About Adultery, Explained

Exodus 20:14

You shall not commit adultery.

This is the seventh of the Ten Commandments, given to Israel at Mount Sinai. It’s short and direct. God places marital faithfulness alongside commands not to murder or steal, showing how seriously He views the marriage covenant. This verse forms the foundation for every other biblical teaching on adultery.

Leviticus 20:10

If a man commits adultery with the wife of his neighbor, both the adulterer and the adulteress shall surely be put to death.

This shows how the Old Testament law enforced the seventh commandment. The penalty applied equally to both parties, which was unusual for the ancient world. It underlines that adultery was treated as a serious crime against the community, not just a private sin.

Matthew 5:27-28

You have heard that it was said, ‘You shall not commit adultery.’ But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.

This is one of the most important verses for understanding the full biblical meaning of adultery. Jesus teaches that the command isn’t only about the physical act. It addresses the heart. Lustful desire, even without physical contact, breaks the spirit of the command. Jesus isn’t adding a new rule  He’s revealing what the command always meant at its deepest level.

Matthew 19:9

I say to you: whoever divorces his wife, except for sexual immorality, and marries another, commits adultery.

Here Jesus addresses divorce and remarriage directly. This verse is part of a larger teaching on marriage (Matthew 19:3-9) where Jesus affirms God’s original design for marriage as a lifelong union. Bible scholars hold differing views on how this verse applies to specific modern situations, so it’s worth studying alongside pastoral guidance rather than in isolation.

John 8:1-11

In this well-known account, religious leaders bring a woman caught in adultery to Jesus, expecting Him to condemn her under the Law. Jesus responds, Let him who is without sin among you be the first to throw a stone at her (v. 7). After her accusers leave, Jesus tells her, Neither do I condemn you; go, and from now on sin no more (v. 11).

Hebrews 13:4

Let marriage be held in honor among all, and let the marriage bed be undefiled, for God will judge the sexually immoral and adulterous.

This verse affirms marriage as something to be honored and protected. It also reminds readers that God takes adultery seriously, even under the New Covenant of grace. Grace does not erase the seriousness of sin; it provides the way to be forgiven and changed.

1 Corinthians 6:9-11

Paul lists adultery among sins that are serious and real, but then adds: And such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.

Spiritual Meaning of Adultery

Beyond the literal act, the Bible often uses adultery as a picture of spiritual unfaithfulness. When people turn away from God to pursue other gods, other priorities, or other sources of security, Scripture calls this spiritual adultery.

James 4:4 says, You adulterous people! Do you not know that friendship with the world is enmity with God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God.

This verse isn’t about a literal marriage. It’s a warning about divided loyalty. Just as adultery breaks trust in a marriage, chasing after worldly values while claiming to follow God breaks trust in that relationship too. This is a consistent pattern throughout Scripture  physical adultery and spiritual unfaithfulness are connected because both involve breaking a covenant of loyalty and love.

Symbolism of Adultery in Scripture

The prophets Hosea, Jeremiah, and Ezekiel use adultery as an extended symbol for idolatry. In Ezekiel 16, God describes His covenant with Israel using marriage imagery, then describes Israel’s turn to false gods as adultery against Him. This symbolism works because marriage itself is meant to reflect God’s covenant faithfulness (Ephesians 5:31-32 draws a similar parallel with Christ and the Church).

This symbolic use doesn’t change what adultery literally means. It borrows the seriousness and pain of marital betrayal to help readers understand how God feels about being replaced by idols or misplaced trust.

Common Misunderstandings

Only married people can sin sexually. Not true. The Bible addresses many forms of sexual sin, including porneia (sexual immorality broadly), which covers sex outside of marriage between unmarried people. Adultery is specifically about breaking an existing marriage covenant, but Scripture treats all sexual sin seriously.

Jesus canceled the Old Testament teaching on adultery. Jesus didn’t cancel it  He deepened it. In Matthew 5:27-28, He extends the command to the heart, showing that the Law’s intent was always about more than outward behavior.

The woman in John 8 got away with it. She wasn’t excused. Jesus told her plainly, sin no more. What she received was forgiveness and a chance to change, not permission to continue.

Adultery is unforgivable. Scripture never teaches this. 1 Corinthians 6:11 and John 8:11 both show that adultery, like every sin, can be forgiven through repentance and faith in Christ.

FAQs

What is the biblical definition of adultery? 

Adultery is voluntary sexual relations between a married person and someone who is not their spouse. It breaks the marriage covenant described in Scripture.

What does the Bible say is the punishment for adultery? 

Under the Mosaic Law, adultery carried the death penalty for both parties (Leviticus 20:10). Under the New Covenant, adultery is treated as sin requiring repentance, and forgiveness is offered through Christ (John 8:11; 1 Corinthians 6:11).

Does Jesus say lust is the same as adultery? 

Jesus teaches that lustful intent is a heart-level form of adultery (Matthew 5:27-28). This doesn’t mean it carries identical earthly consequences to the physical act, but it shows the sin begins internally, not only externally.

Is adultery the only ground for divorce in the Bible? 

Matthew 19:9 mentions sexual immorality as an exception clause regarding divorce and remarriage. Christians and scholars hold different views on how this applies today, so this is a good topic to study with a pastor or trusted biblical counselor.

What is spiritual adultery in the Bible? 

Spiritual adultery refers to unfaithfulness to God, often described through idolatry or divided loyalty (Jeremiah 3:8-9; James 4:4). It uses the imagery of marital betrayal to describe turning away from God.

Can adultery be forgiven according to the Bible? 

Yes. Scripture consistently shows that adultery, like all sin, can be forgiven through genuine repentance and faith in Jesus Christ (1 Corinthians 6:11; John 8:11).

Conclusion

Adultery in the Bible means more than a broken rule. It’s a broken covenant  a wound to marriage, to trust, and ultimately to the reflection of God’s faithfulness that marriage is meant to show. Scripture doesn’t soften this. From the Ten Commandments to Jesus’ words on the heart, adultery is treated as serious sin.

Come now, let us reason together, says the Lord: though your sins are like scarlet, they shall be as white as snow (Isaiah 1:18).

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