Clean and Unclean

The distinction between clean and unclean pervades the Mosaic law, governing food (Leviticus 11; Deuteronomy 14), bodily conditions (Leviticus 13–15), contact with the dead (Numbers 19), and the fitness of animals for sacrifice. Clean animals were distinguished from unclean by criteria such as divided hooves and cud-chewing in land animals, fins and scales in sea creatures, and specific characteristics in birds. These distinctions set Israel apart from surrounding peoples and trained habits of discrimination and holiness.

The clean-unclean system functioned as a symbolic map of the holy and the profane, with the sanctuary as the center of purity and death as the extreme of uncleanness. Before the flood, Noah preserved both clean and unclean animals, but offered only the clean as burnt offerings (Genesis 7:2; Genesis 8:20). The New Testament records the decisive reinterpretation of these categories: Peter's vision in Acts 10 and Jesus's teaching in Mark 7 signaled that the dietary and purity laws had been fulfilled, with the deeper issue being moral and spiritual cleanliness of the heart.