Book of Deuteronomy have given various answers to the problem. The Deuteronomistic history theory is currently the most popular (Deuteronomy was originally just the law code and covenant, written to cement the religious reforms of Josiah, and later expanded to stand as the introduction to the full history); but there is an older theory which sees Deuteronomy as belonging to Numbers, and Joshua as a sort of supplement to it. This idea still has supporters, but the mainstream understanding is that Deuteronomy, after becoming the introduction to the history, was later detached from it and included with Genesis-Exodus-Leviticus-Numbers because it already had Moses
Book of Exodus Book of Exodus The Book of Exodus or Exodus is the second book of the Torah and the Hebrew Bible (the Old Testament) immediately following Genesis. The book tells how the Israelites leave slavery in Egypt through the strength of Yahweh, the god who has chosen Israel as his people. Led by their prophet Moses they journey through the wilderness to Mount Sinai, where Yahweh promises them the land of Canaan (the "Promised Land") in return for their faithfulness. Israel enters into a covenant with Yahweh who gives them their laws and instructions to build the Tabernacle, the means by