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Leviticus 18:6-18
A new unit begins with a general prohibition, then moves through a detailed list of forbidden sexual unions among close family relations.
Meaning in context
A new unit begins with a general prohibition, then moves through a detailed list of forbidden sexual unions among close family relations.
Section 2 of 5
Close-Kin Sexual Boundaries Listed
A new unit begins with a general prohibition, then moves through a detailed list of forbidden sexual unions among close family relations.
Movement
Life before the holy God
Artifact
Priestly instruction and sacred space
Biblical Timeline
Exodus & Settlement
Leviticus context: 1500 BC - 1000 BC
Biblical Timeline
Exodus & Settlement
Leviticus context
Exodus & Settlement / 1500 BC - 1000 BC
Leviticus context is set in the exodus and settlement period, where Moses, the exodus, wilderness, covenant instruction, conquest, and judges.
Scripture Text
Thesis
A new unit begins with a general prohibition, then moves through a detailed list of forbidden sexual unions among close family relations.
Verse by Verse
General boundary and authority claim The passage begins with a broad rule: no one is to “approach” a close relative in order to “uncover nakedness,” meaning sexual access is forbidden within close kin. The rule is backed by a direct claim of authority: “I am Yahweh,” presenting the command as coming from Israel’s covenant God.
Parents, stepparent, and sisters The list first forbids sexual relations with one’s mother (described as uncovering the nakedness of father and mother), then with a father’s wife (a stepmother situation), treating it as a violation of the father. It prohibits sexual relations with a sister, whether she shares the same father or mother and whether she was raised in the same home or elsewhere. It also forbids a father’s wife’s daughter “conceived by your father,” clarifying a half-sister case even if she comes through the father’s marriage.
Aunts and in-laws Next, the text prohibits sexual relations with a father’s sister and a mother’s sister, calling them near kin. It then forbids sexual relations with a father’s brother’s wife (an aunt by marriage). It also bans sexual relations with a daughter-in-law and with a brother’s wife, describing the latter as a violation involving the brother’s “nakedness,” linking the act to the brother’s marital sphere.
Literary Context
This unit sits inside a larger speech in Leviticus 18 that contrasts Israel’s way of life with surrounding peoples and sets boundaries for sexual behavior. Verses 6–18 function as the first major list within the chapter, focusing specifically on relatives and household connections. The repeated wording (“you shall not uncover…”) builds a steady rhythm: a general principle is stated, then particular cases spell out what the principle covers. The section also prepares for later parts of the chapter that address other prohibited sexual acts beyond close-kin boundaries.
Historical Context
In an ancient Near Eastern tribal society, family households, inheritance lines, and marriage alliances were central to economic survival and social stability. Rules about who could marry or have sexual relations with whom helped define kinship boundaries, protect family authority structures, and prevent conflicts within extended households. The wording assumes multigenerational family settings, remarriage (a “father’s wife”), and the presence of in-law relationships. The repeated divine self-identification (“I am Yahweh”) frames these limits as community-defining instruction for Israel’s life after leaving Egypt and before settling in the land.
Theological Significance
Questions
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Two-generation pairings and sisters as rivals The passage then forbids taking both a woman and her daughter, or a woman together with her granddaughter (through either son or daughter). These are labeled “near kinswomen,” and the act is explicitly called “wickedness.” Finally, it prohibits taking a wife “to her sister” in a way that makes the sister a rival, specifying the restriction applies “in her lifetime,” which targets simultaneous relationships rather than the later situation after death.
Leviticus 18:6–18 sets a fence around sexual access inside a family network. It starts with a general rule (v.6) and then spells out examples. The repeated phrase “uncover nakedness” functions as the passage’s standard way to speak about sexual relations, not merely accidental exposure.
The list moves from the most immediate household ties (mother, father’s wife, sisters, granddaughters) to extended relations (aunts, in-laws). Several prohibitions describe the act not only as wrong toward the woman involved but also as a violation of the “nakedness” of a father or brother (vv.8, 16), showing that family bonds and household order are part of what is being protected.
The section is framed as God’s own boundary-setting for Israel (“I am Yahweh,” v.6), meaning these are presented as community-defining moral limits, not optional social preferences.
Two questions draw real differences.
First, how wide the opening phrase “close relatives” (v.6) reaches. Some read v.6 as a headline that is fully defined by the cases that follow: the “close relatives” are essentially the ones listed here (and in the rest of the chapter). Others think v.6 signals a broader principle that can extend to comparable kin relations even if not named, with the list functioning as key examples rather than an exhaustive map.
Second, how to read the ban about a man taking “a wife to her sister… besides the other in her lifetime” (v.18). Many understand this as a prohibition against marrying (and having sexual relations with) two sisters at the same time, aimed at preventing rivalry in the household. Others argue it is broader, treating marriage to a wife’s sister as forbidden even after the wife’s death; they see “in her lifetime” as emphasizing the offense rather than limiting the time frame.
The passage uses idioms (“uncover nakedness”) and relational shorthand (“it is your father’s nakedness,” “your brother’s nakedness”) that require interpretation. Also, some lines include time markers (“in her lifetime,” v.18) while most do not, so readers debate whether that time marker is meant to narrow only that specific case or reflect a more general pattern.
This text clearly portrays incest and close-kin sexual relationships as incompatible with Israel’s covenant identity, and it defines “close kin” in concrete, household-based terms (parents, stepparents, siblings, descendants, aunts, in-laws). It also shows that sexual behavior is treated as affecting whole-family integrity (not just two individuals), and it roots these boundaries in God’s stated authority over the community (v.6). For later biblical discussion, it supplies a baseline list of prohibited unions that other passages sometimes assume or address in special scenarios (for example, questions about a brother’s wife elsewhere; compare Deuteronomy 25:5–10).
uncover (ṯə·ḡal·lêh)