Short answer: Leviticus 18:6–18 forbids a person from approaching a close relative to uncover nakedness, and it lists the relationships by name: parents, siblings, grandchildren, aunts and uncles, in-laws, and a woman with her daughter or her sister. Because the Bible treats sexual union as belonging inside the marriage covenant, marrying a family member falls under the same prohibition rather than escaping it. The passage grounds the boundary not in custom but in God's own identity, repeating that he is Yahweh. The command draws a line around the family, protecting it from becoming a place of sexual access.
The setting of leviticus 18:6-18: covenant law for a people entering canaan
Leviticus 18:6–18 is covenant law, spoken by Yahweh to Israel through Moses at Sinai. The people are camped between Egypt, which they left, and Canaan, which they are about to enter. Verses 4 and 5 set the tone before any prohibition is named: God calls these rules his own statutes and ordinances, and he promises that the one who keeps them will live in them. The list is therefore presented as a way of life given by the God who brought Israel out, not as arbitrary restriction. The same chapter warns Israel against the practices of the nations around them and says the land itself was defiled by those practices.
The literary shape is a list of prohibitions, each introduced by the same formula and each naming a specific relative or household situation: father, mother, sister, granddaughter, aunt, daughter-in-law, brother's wife. The repetition is deliberate. The wording moves outward from the closest bonds of the household to wider boundaries, and it ends by naming such things as wickedness. The immediate context of verses 6 to 18 is the family and the home. The wider context is the holiness of a people who bear God's name in a land full of other gods, so these commands belong to worship and identity, not only to private morality.
This passage addresses incest and sexual harm inside families. If you have lived through that kind of harm, you are not being asked to work through this text alone. Speak with a pastor and with safe professional help, and let trusted people walk with you. What the passage makes clear is that God sees the household as a place of covenant faithfulness, not a place where the strong may take what they want. Grace comes first: God's own character stands behind these commands, and our response is to walk in his statutes rather than in the patterns of the surrounding culture.
What the wording of leviticus 18 actually says
The list opens with a general rule before it names any particular relative: no one is to approach a close relative to uncover nakedness (18:6). Two words carry the weight. Approach describes coming near on purpose, so the command addresses a deliberate move toward someone, not a hug at a family gathering. Uncover the nakedness is the passage's steady way of speaking about sexual relations, a plain euphemism repeated line after line rather than a technical legal formula. The setting matters too. Israel is being told not to copy the practices of Egypt behind them or Canaan ahead of them, and to keep God's statutes instead (18:3–5). The boundaries are given as God's own, not as local custom.
Several prohibitions explain themselves by pointing to a bond that already exists. A man is not to uncover his father's wife because it is his father's nakedness (18:8); he is not to uncover his brother's wife because it is his brother's nakedness (18:16). The offense is not only against the person approached but against the relationship that already holds the household together. The list works outward through the family: parents, siblings, grandchildren, aunts and uncles, a daughter-in-law. Verse 17 adds a stronger label, calling the pairing of a woman with her daughter or granddaughter wickedness, and verse 18 names a further concern, taking a sister as a rival while the first wife is still alive.
Read carefully, the passage is describing forbidden unions, not prescribing how every family should arrange its life. It gives wisdom about protecting the bonds God has already made, and it speaks with unusual directness because sexual harm inside a family damages people who had every right to be safe. If this text touches your own story, you are not being asked to carry it alone. Take it to a pastor and to safe professional help, and let trusted people walk with you. The passage's first word to Israel was not shame but a call to live differently, and that call still comes with grace in Christ ahead of it.
What the list of forbidden relationships claims
The chapter opens by placing everything that follows under God's own statutes, and Leviticus 18:5 attaches a promise to keeping them: the one who does them shall live in them. So the list is presented as a way of life, not an arbitrary rule. The prohibitions then name concrete relationships rather than a vague unease: father and mother, sisters born at home or abroad, granddaughters, aunts, a father's brother's wife, a daughter-in-law, a brother's wife, and a woman together with her daughter or her sister. The wording is consistent. Each line forbids approaching a near relative to uncover nakedness, which describes sexual union, and each line draws a boundary around the household.
The ground given is not custom or culture. Twice in these verses God says, I am Yahweh, and the surrounding chapter explains why that matters. Israel is warned against the practices of Egypt, where they came from, and of Canaan, where they are going, and the text says the land itself was defiled by those practices. That framing tells us these boundaries are a standard God holds nations to, not merely Israelite etiquette. The list then widens outward from the family to a menstruating woman, a neighbor's wife, and child sacrifice, so the household is the immediate setting and the holiness of a people bearing God's name is the wider one.
Because marriage in Scripture is the covenant setting for sexual union, marrying a family member falls under the same prohibition the text names. What the passage forbids is the act, and it treats that act as a violation of the family's own structure, not only of two individuals. This is where some readers disagree about how far the list extends today, yet what stays central is plain: God's character stands behind the boundary, and the family is meant to be a place of safety. If you have experienced this kind of harm, speak with a pastor and with a safe professional counselor rather than carrying the text alone.
Where careful readers disagree about the family list
Evangelical readers agree on the core: Leviticus 18 forbids sexual union within the close family, and verse 6 sets the frame for everything that follows, telling Israel that no one may approach a close relative to uncover nakedness. The list then names specific cases, from parents and siblings to aunts, nieces, a daughter-in-law and a brother's wife. Most readers also agree this bears on whom a person may marry, since marriage involves the union the passage prohibits. The disagreements come at the edges, and they are worth naming honestly rather than flattening.
One dispute is how far the list reaches. Cousins are not named, though aunts and nieces are, so some readers treat the list as exhaustive and others as examples of the principle in verse 6. A second dispute concerns verse 18, about taking a wife in addition to her sister: some read it as a narrow rule for one lifetime, others as a wider principle about rivalry in a household. A third concerns the penalties and civil arrangements of the surrounding chapters. Israel had judicial machinery the church does not carry, so readers differ over how those provisions apply now.
What stays central is that God himself is the reason given throughout: "I am Yahweh." The boundary is not a cultural preference Israel invented, and the church is not free to set it aside. Where the text is specific, follow it; where readers infer beyond it, say so plainly and hold the inference with humility. If this passage touches wounds of abuse or incest in your own story, do not carry it alone. Bring it to a pastor and to safe professional help, and let trusted people walk with you.
How the holiness of leviticus 18 points to Christ
Leviticus 18:6–18 reads like a fence drawn around a household. The list moves outward from the closest bonds, father and mother, sister, granddaughter, aunt, daughter-in-law, brother's wife, and it repeats a plain reason: these are near kin. The command is not arbitrary. God is forming a people who will live differently from the nations around them, and he anchors the whole chapter in his own identity. Leviticus 18:4 says, "You shall do my ordinances. You shall keep my statutes and walk in them. I am Yahweh your God." Holiness here is not a mood. It is a household shaped by the character of the God who claims it.
The same chapter also shows how quickly desire reaches for what God has fenced off. That is why the New Testament does not treat these commands as a relic to be set aside. Jesus said he came to fulfill the law, not to loosen it, and the cross tells the truth about how seriously God takes this. Christ bore the curse for those who have broken these commands, which means no reader of this text stands outside mercy. The man who has failed here is not disqualified from grace. He is exactly the kind of person grace was given for.
The gospel also creates a new kinship. Because the church is called a family, brothers and sisters in Christ now relate to one another with the purity and honor this passage describes. That holiness is not produced by rule keeping but by the Spirit, who makes a people zealous for good. If this text has touched your own story of family harm, do not carry it alone. Speak with a pastor and with safe professional help. The Lord who drew this fence is the same Lord who draws near to the wounded.
What faithful response looks like when the text has spoken
Start with the plain sense of the passage. Leviticus 18:6 sets the boundary for everything that follows: no one is to approach a close relative to uncover nakedness, and the reason given is simply that God is Yahweh. The list that follows is not a set of suggestions for private conscience but a catalogue of relationships God places off limits, from parents and siblings to aunts, daughters-in-law and a wife's close kin. Verse 5 ties obedience to life, and verse 4 to walking in God's statutes. A reader asking whether marriage to a family member is a sin should take the text at its word rather than negotiating it down.
The honest next step is specific. Name the relationship plainly, without softening the terms, and take it to a pastor who can help weigh the details. Where the exact degree of relation is unclear, ask rather than assume, and lean toward the boundary the text draws instead of testing how close to it you can stand. If a family is already entangled in a relationship this passage forbids, the path is truthfulness and repentance, not concealment. Grace is the ground here: the God who says I am Yahweh also forgives and redirects those who have failed. Obedience may cost a relationship or a plan, and nothing in the text promises ease.
This passage also touches incest and family sexual abuse, and a reader who has lived through that harm should not work through it alone. Speak with a pastor and with safe professional help; the text's boundaries are meant to protect, not to burden a victim with shame. For everyone, the response is the same in shape: hear the command as from God, act on it in ordinary decisions about whom to marry, and bring failure into the light rather than hiding it. The passage closes with the neighbor's wife and the community's life in view, reminding us that these private choices are never only private.
Biblical fidelity check
Leviticus 18:6–18 is read here as a list of prohibited sexual unions inside the close family, spoken to a people about to enter Canaan. The repeated phrase "uncover the nakedness" is the passage's ordinary way of naming sexual relations, not a technical code, and the word approach carries intent, so the command addresses deliberate action. Several lines explain the offense by tying it to a bond already in the household, calling it the father's or brother's nakedness. Verse 18 adds the concern of creating a rival. Reading the list this way guards against treating it as vague sentiment.
The real disagreement is how far the list reaches. The text names aunts and nieces but not cousins, and readers differ over whether verse 6 states a broad principle or simply introduces the cases that follow. Others differ on whether Israel's penalties and civil arrangements in the surrounding chapters transfer to the church, which has no such judicial machinery. Some read verse 18 narrowly, others as a wider word about rivalry. What stays central is that God forbids sexual union within the close family, gives himself as the reason, and the church may not set that boundary aside.
Related studies for Leviticus 18:6-18
For a wider study, compare this passage with the sexual ethics of Leviticus 18: Holiness and Forbidden Relations, the covenant vision of marriage in Leviticus 19: Holiness in Everyday Life, and the way the New Testament handles Old Testament law in Leviticus 20: Holiness and Its Boundaries. A careful look at the holiness theme of Leviticus, especially Leviticus 21: Priests, Holiness, and Physical Defects, shows why the character of God stands behind every command here.
Frequently asked questions
Does Leviticus 18 forbid marrying a cousin, or only closer relatives?
The list in Leviticus 18:6–18 does not name cousins. It names parents, siblings, grandchildren, aunts, uncles, in-laws, and a woman together with her daughter or her sister, and it opens with a general command not to approach any close relative. So the passage speaks directly to those relationships and does not settle the cousin question by name. Readers who want to apply it carefully should notice both the specific list and the wider principle behind it, and should seek wise pastoral counsel rather than treating the silence as permission or as prohibition.
Is it a sin to marry someone who is already related to me by marriage, such as a brother's widow or an in-law?
Leviticus 18:6–18 does address some relationships formed by marriage, naming a father's wife, a daughter-in-law, a brother's wife, and an aunt by marriage. Those commands sit in a specific covenant setting, and other parts of Scripture describe a brother's widow in different terms, so the passage is not a simple blanket rule for every in-law case today. What stays central is that the family is not a pool of sexual partners and that marriage is not a loophole around that boundary. Christians navigating a particular in-law situation should weigh the whole of Scripture and seek counsel from a pastor who knows them.
How should a Christian respond if they are already married to a family member?
The passage does not tell a person in that situation what to do next, and it should not be used to heap shame on someone who is already carrying a heavy weight. What it does make clear is that God's commands are about protecting the family, and his character is the reason he gives, not contempt for the people involved. A person in this position should speak with a pastor and, where there has been harm or abuse, with safe professional help, rather than working it out alone. Grace comes first: God's action in Christ meets people where they are, and honest counsel is part of how that grace takes shape in a real life.
