Exodus 20:14 Commentary: The Scope of the Seventh Commandment

Exodus 20:14 stands in the middle of the Ten Commandments, the “second table” that governs relationships between neighbours. Before the law was given at Sinai, marriage in the ancient Near East was already recognized as a sacred covenant. Adultery was more than a personal failure, it was a breach of that covenant, a theft of a husband’s exclusive right, and a threat to family lineage. The Hebrew verb na’aph is used consistently for the act of a man with another man’s wife, or a wife with another man (Leviticus 20:10). Fornication is expressed by a different verb, zanah.

Israel’s neighbours, including Egypt and Canaan, treated adultery as a civil offense, often punishable by death or heavy fines. The Decalogue elevates the prohibition to a divine command, not merely a social rule. Placing it among the ten underscores that sexual fidelity is woven into the fabric of covenant loyalty. Some ancient manuscripts (the Nash papyrus, Septuagint, and several New Testament references) place this command before “You shall not murder,” possibly indicating a slightly different tradition. But the content is unchanged: marriage is holy, and violating it offends both neighbour and God.

The tenth commandment then forbids coveting a neighbour’s wife, showing that the law addresses both the outward act and the inward desire. The seventh command stands as a bulwark protecting the marriage bed.

The verse reads identically in all major Hebrew manuscripts (Masoretic Text) and ancient translations. The only textual variation noted by the supplied commentators involves the order of verses: in the Septuagint, the Nash papyrus, and some New Testament citations (Mark 10:19, Romans 13:9), the seventh commandment is placed before the sixth (“You shall not murder”). This ordering difference is well documented but does not affect the text or meaning of the command itself.

The seventh commandment has been consistently interpreted by the church as a broad prohibition of sexual sin. Jesus himself expanded it to cover lustful looks (Matthew 5:27-28), making clear that the law judges the heart. Early Christian writers like Clement of Alexandria and Augustine applied the command to all forms of impurity, including prostitution and homosexual acts, arguing that believers are called to bodily holiness. The Reformation tradition, represented here by Calvin, emphasized that the Law is a perfect rule of life, so forbidding adultery implies forbidding every kind of uncleanness. In modern times, the command continues to speak to questions of pornography, marital faithfulness, and the sacredness of sex. All traditions affirm that grace and forgiveness are available through Christ, while the standard remains God’s design for marriage.

Three-point outline

1. The act itself is forbidden. Adultery, defined as sexual intercourse with a married person not one’s spouse, is directly prohibited. This protects the marriage covenant and the trust it requires.
2. The root is also judged. Jesus and the commentators show that lust, fantasy, and anything that leads to the act falls under the same prohibition. The command reaches into the heart.
3. The positive call. Every prohibition implies a positive duty. This command calls God’s people to honour marriage, pursue purity, and build faithfulness in every relationship.

Five-point outline

1. Specific sin named: Adultery with another’s spouse.
2. Broader application: Fornication, incest, homosexual acts, and all sexual immorality (see Leviticus 18).
3. Inner dimension: Unclean thoughts, desires, and lustful looks (Matthew 5:27-28).
4. Negative and positive: “Do not commit adultery” includes “Do protect the sanctity of marriage” and “Do cultivate chastity.”
5. Community witness: The command guards not only individuals but the whole people of God, set apart for holy living.

Illustration hooks

• The ripple effect of a single act of infidelity: broken families, lost trust, wounded children. A broken marriage covenant rarely hurts only two people.
• The power of a glance: what started as a moment of attention became David’s catastrophic sin with Bathsheba (2 Samuel 11). The commandment stands at the doorway before the act ever occurs.
• Modern culture treats sexual desire as a need that must be met, but God’s Law frames it as a gift to be stewarded within covenant boundaries.

Questions your congregation is asking

• What about unmarried people? Does this command apply to them, or only to married couples?
• Is looking at pornography a form of adultery? How does Jesus’ teaching relate to private, imagined sin?
• How can a person who has broken this command find forgiveness and restoration?

This short command strikes at the heart of relationships and faithfulness. In a world of broken commitments, what does God require? The command is plain, but its reach extends further than many assume. Let the text lead your discussion, and let the group speak honestly about the pressures and struggles of living in a sexualized culture.

Discussion questions

1. What does the word “adultery” mean in its strict sense? Why do you think God singles out this specific sin in the Ten Commandments?
2. Read Matthew 5:27-28. How does Jesus expand the meaning of this command? What does that tell you about God’s concern for the heart?
3. Adam Clarke writes that the command forbids “all impure books, songs, paintings, etc.” How would you apply that to today’s media and entertainment?
4. Calvin argues that if the Law only forbade adultery, it would imply that fornication is acceptable. Do you agree? Why or why not?
5. How does the tenth commandment (not coveting your neighbor’s wife) relate to the seventh? What do they together teach about God’s standard?
6. Why is sexual purity so important in the Bible? What does it have to do with our relationship with God?
7. What practical steps can your group take to guard against sexual sin while also extending grace to those who have fallen?