Book excerpt: Applying criteria for the identification of biblical Hebrew poetry, Jason M. H. Gaines distinguishes a nearly complete poetic Priestly stratum in the Pentateuch (“Poetic P”), coherent in literary, narrative, and ideological terms, from a later prose redaction (“Prosaic P”), which is fragmentary, supplemental, and distinct in thematic and theological concern. Gaines describes the whole of the “Poetic P” source and offers a Hebrew reconstruction of the document. This dramatically innovative understanding of the history of the Priestly composition opens up new vistas in the study of the Pentateuch.