Leviticus 18 and 20: ancient purity or moral law?

What the chapters contain

Leviticus 18 and 20 are bookends of the Holiness Code (Lev 17-26), a literary unit characterized by the refrain 'I am the LORD' and the repeated call 'you shall be holy, for I the LORD your God am holy' (19:2; 20:7, 26). Chapter 18 sets up the prohibitions; chapter 19 contains the ethical heart of the code (including 'love your neighbor as yourself,' 19:18); chapter 20 returns to the prohibitions of chapter 18 with sanctions attached.

Chapter 18 is structured as a single frame around a list. The frame is the warning at verses 1-5 and 24-30: do not do as Egypt does or as Canaan does; the land vomited out its previous inhabitants for these practices, and it will vomit you out too. The list in between covers prohibited sexual relationships (incest, with explicit naming of mother, stepmother, sister, granddaughter, aunt, daughter-in-law, sister-in-law, and others), intercourse with a menstruating woman, adultery, the Molech prohibition (18:21), the same-sex prohibition (18:22), and bestiality (18:23).

Chapter 20 covers many of the same prohibitions in a different order, with capital and karet (cutting-off) penalties attached. It opens with the Molech prohibition again (20:2-5) and the prohibition of necromancy (20:6, 27). Most of the sexual prohibitions of chapter 18 reappear here with explicit sanctions. The same-sex prohibition is at 20:13 with the death penalty. The chapter closes with the same 'land will vomit you out' refrain (20:22-26).

The four positions

The three diagnostic texts: Molech, 18:22, and the Canaan frame

Three places in chapter 18 are where the four positions differ most. The Molech clause at verse 21 is sandwiched between sexual prohibitions and is the strongest evidence the chapter is about cultic identity rather than free-standing sex ethics. The same-sex clause at verse 22 is the most contested element in modern reception. The 'land of Canaan' framing at verses 3 and 24-30 is where the chapter is anchored to a specific people in a specific land. Reading the same three passages alongside each position shows what each is committed to.

What 'abomination' means in Leviticus

The Hebrew word to'evah ('abomination') appears at Lev 18:22 and 18:26-30. It is not the same word used for ritual impurity in the food laws of Lev 11 (which uses tame', 'unclean,' and sheqets, 'detestable'). The to'evah vocabulary in Leviticus is concentrated in chapter 18, and it reappears in Deuteronomy primarily for idolatry, child sacrifice, divination, and certain sexual practices.

The universal-moral-law and two-tier positions weight the choice of to'evah heavily. It is a moral category, not a ritual one. The Holiness-Code reading replies that to'evah is used elsewhere for things that are not abstract moral evils (Deut 14:3 uses it for unclean food; Prov 11:1 uses it for dishonest scales but also 11:20 for the merely 'crooked of heart'). The vocabulary by itself does not decide the category; it has to be read in context.

What the four positions agree on is that to'evah marks the prohibitions in chapter 18 as more serious than the ritual-impurity violations of chapters 11-15. They disagree on whether 'more serious' means 'universal moral law' or 'most-serious-cultic-identity-violation.'

What chapter 20's death penalty does and does not establish

Most of the sexual prohibitions of chapter 18 reappear in chapter 20 with capital sanctions. Adultery (20:10), incest (20:11-12, 14, 17), the same-sex prohibition (20:13), and bestiality (20:15-16) all carry the death penalty. The Molech prohibition (20:2-5) also carries death. The intercourse-during-menstruation prohibition (20:18) carries karet (cutting off) rather than the death penalty, which is the only sanction differential inside the chapter.

Every position has to address the death-penalty sanctions, and none of them (including the most traditional) holds that the sanctions are still in force. The four positions differ on why. The universal-moral-law position generally argues the moral prohibitions remain in force but the civil sanctions were specific to the theocratic order. The Holiness-Code position argues the whole structure (prohibitions plus sanctions plus frame) was Israel-specific. The two-tier position holds the moral prohibitions transfer but the civil sanctions do not. The trajectory position reads the lapse of the sanctions as evidence the prohibitions themselves are also subject to redemptive-movement re-reading.

How the New Testament handles the chapters

The New Testament references Leviticus 18-20 in three places. Romans 1:24-27 and 1 Corinthians 6:9-11 are the most-cited because of their treatment of same-sex behavior; Acts 15:20, 29 is the most-cited for what is and is not required of Gentile converts; the broader citation of 'love your neighbor' (Lev 19:18 in Matt 22:39, Mark 12:31, Luke 10:27, Rom 13:9, Gal 5:14, Jas 2:8) treats the central ethical commandment of the Holiness Code as the heart of the law.

Acts 15 is the most diagnostic passage for the four positions. The Jerusalem Council decided what to require of Gentile converts and listed four prohibitions: abstention from things polluted by idols, from sexual immorality (porneia), from things strangled, and from blood. The list is much shorter than Leviticus 17-26. The universal-moral-law and two-tier positions argue porneia covers the whole Lev 18 sexual code, on the grounds that porneia in second-temple Greek usage tracked with the Levitical incest and forbidden-relations list. The Holiness-Code and trajectory positions argue the Acts 15 list is genuinely selective and that the council's silence on the rest of Leviticus 18 is significant.

Romans 1:24-27 is the most-disputed NT continuation passage. Paul describes God 'giving up' a society to dishonorable passions and lists same-sex behavior as one consequence. The universal-moral-law and two-tier positions argue Paul is directly continuing the Leviticus 18:22 / 20:13 prohibition. The trajectory position (Brownson, Vines) argues Paul is addressing a Greco-Roman cultural form of the behavior (idolatry-linked, exploitative) that is not parallel to all forms of same-sex relationship in question today. The dispute is genuine and the four positions do not collapse into each other on the exegesis of Rom 1.

Where the four positions actually disagree

The positions disagree on three questions. First, what kind of text is the Holiness Code. Universal-moral-law and two-tier readings take it as containing free-standing moral content alongside its cultic frame. Holiness-Code-separation and trajectory readings take the cultic frame as decisive about the genre of the whole. Second, how should the Christian reader handle the OT law more broadly. The Aquinas-Calvin two-tier tradition draws a moral-civil-ceremonial line. The Reformed traditional view (close to universal-moral-law) keeps the moral content binding. Milgrom-and-Knohl (close to Holiness Code) treats the unit as Israel-specific. The redemptive-movement model (Webb, Brownson) puts most of the canon's ethical content in motion. Third, what does the NT do with this material. All four positions read Acts 15, Rom 1, 1 Cor 6, and the love-your-neighbor citations differently.

On the specific question of the same-sex prohibition, the universal-moral-law and two-tier positions converge on continued moral force. The Holiness-Code position takes the prohibition as having been Israel-specific in its original context but does not by itself decide modern ethics. The trajectory position holds the prohibition is contextually limited and that the NT material does not require its continuation in the form traditional readings have given it. The four positions are not arranged as two pro-and-two-con on the contemporary ethical question; they are four different reads of what kind of text the chapters are.

Reading Leviticus 18 and 20 with the question open

What the chapters are doing inside Leviticus is clearer than what they require of contemporary readers. The Holiness Code calls Israel to a sanctuary-grade life: to be holy as the LORD is holy. The sexual prohibitions are part of that call, sitting alongside the prohibition of mistreating the poor (19:9-10), the call to love the neighbor (19:18), the prohibition of taking advantage of the deaf and blind (19:14), the requirement to leave field corners for the immigrant (19:9-10, 33-34), and the prohibition of false weights (19:35-36). All four positions agree that this is the literary unit the same-sex prohibition sits inside.

What the chapters require of contemporary readers is where the four positions hold different ground, and each has costs the other three are not willing to pay. The universal-moral-law reading keeps the chapter's plain force at the cost of needing to draw a line inside the chapter between binding and non-binding prohibitions. The Holiness-Code reading preserves the chapter's literary integrity at the cost of not deciding the contemporary question by direct extraction. The two-tier reading inherits a long Christian interpretive tradition at the cost of using post-canonical categories the Hebrew text does not give. The trajectory reading takes the NT's selectivity seriously at the cost of needing to identify which biblical trajectories are still in motion. Most readers who have stayed with these chapters end up holding a position with borrowed pieces from another. What the chapters require is that the reader name what each position costs.