Book of Numbers twelve princes, one of each tribe. The majority of modern biblical scholars believe that the Torah (the books of Genesis, Exodus, Leviticus, Numbers, and Deuteronomy) reached its present form in the post-Exilic period (i.e., after c.520 BCE), based on pre-existing written and oral traditions and "contemporary geographical and demographic details but even more importantly from contemporary political realities". The five books are often described as being drawn from four "sources" - schools of writers rather than individuals - the Yahwist and the Elohist (frequently treated as a single source), the Priestly source and the Deuteronomist. There is ongoing dispute over
Leviticus Rabbah composed largely of older works. Its redactor made use of Genesis Rabbah, Pesikta de-Rav Kahana, and the Jerusalem Talmud, in addition to other ancient sources. The redactor appears to have referred also to the Babylonian Talmud, using several expressions in the sense in which only that work employs them. Leviticus Rabbah is not a continuous, explanatory interpretation to Leviticus, but a collection of exclusive sermons or lectures on the themes or texts of that book. It consists altogether of 37 such homilies, each of which constitutes a separate chapter. Leviticus Rabbah often refers to Scriptural passages on which the homilies