The Law, the Torah, or the Pentateuch, consisted of first five books that were developed over a number of years, but firmly established around 400 BCE. The five books of the Pentateuch include Genesis, a 10th-5th century BCE writing about the pre-existence of the Israelites, and the particular stories of Abraham, Isaac, Jacob, and Joseph. The Exodus, finished around 450 BCE, recalls the story of Moses and how he led the Israelites out of Egypt for years in the desert. Leviticus and Numbers, worked on between 550-400 BCE, lay out the particular codes, rules and regulations for the Israelites, as well the numbers of people that were involved in the exodus from Egypt. Deuteronomy, developed in the 7th-6th century BCE, told the story of Moses in the wilderness with emphasis on the laws of the heart. This Law or Torah explained the early or pre-history of the Israelites before they entered the promised land. These books also contained all the commands, statutes, or rules for the Israelites after they entered the promised land. All further Jewish developments were based on the Torah or the Law.