Levitical sexual prohibitions

The Levitical sexual prohibitions are a set of commands in Leviticus 18 and 20 that regulate sexual relations through the paired concerns of holiness and communal survival. They distinguish forbidden kinship and other conduct, apply their standards to native Israelites and resident strangers, and warn that violations defile the land and may bring expulsion.

The Prohibited Relationships

The rules begin with a general ban on sexual relations between close kin and then specify the relationships covered: a parent or stepparent, a sister or half-sister, a granddaughter, an aunt, a daughter-in-law, and a brother’s wife. They also prohibit taking a woman and her sister as rivals while both are living. The list describes kinship boundaries in detail, making household relations—not only individual conduct—the framework for defining prohibited unions.

Other Prohibitions and Scope

The chapter also prohibits adultery, intercourse during a woman’s menstrual impurity, relations between men, and sexual relations with animals. It forbids giving offspring to Molech, placing that act alongside the sexual rules as conduct that profanes the divine name. The commands address the whole community, explicitly including both native Israelites and resident strangers; the text presents them as binding standards rather than rules limited to one household or status.

Sanctions and Land

Leviticus 20 assigns penalties to several violations, including death for adultery, relations with a daughter-in-law, relations between men, and sexual relations with animals; some other offenses incur being cut off from the community, while relations with an uncle’s wife or a brother’s wife are associated with childlessness. These sanctions give the prohibitions distinct consequences rather than treating every breach alike.

The rules connect communal conduct to the land’s continued possession. The text says that the nations were expelled because such practices defiled the land, warns that the land could likewise vomit out Israel, and presents obedience as part of Israel’s separation as a people set apart by God. The prohibitions therefore frame sexual conduct not only as a matter of household boundaries but also as a condition bound to holiness, communal belonging, and security in the land.