Old Testament – Genesis, Exodus, Leviticus, book of Numbers and Deuteronomy – reached their present form in the Persian period (538–332 BC), and their authors were the elite of exilic returnees who controlled the Temple at that time. The books of Joshua, Judges, Samuel and Kings follow, forming a history of Israel from the Conquest of Canaan to the Siege of Jerusalem c. 587 BC. There is a broad consensus among scholars that these originated as a single work (the so-called "Deuteronomistic history") during the Babylonian exile of the 6th century BC. The two Books of Chronicles cover much the same material
Book of Leviticus have concluded that the Pentateuch received its final form during the Persian period (538–332 BC). Nevertheless, Leviticus had a long period of growth before reaching that form. The entire book of Leviticus is composed of Priestly literature. Most scholars see chapters 1–16 (the Priestly code) and chapters 17–26 (the Holiness code) as the work of two related schools, but while the Holiness material employs the same technical terms as the Priestly code, it broadens their meaning from pure ritual to the theological and moral, turning the ritual of the Priestly code into a model for the relationship of Israel to