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
Old Testament Elijah (as promised by the prophet Malachi, whose book now ends the Old Testament and precedes Mark's account of John the Baptist). None predicted a Messiah who suffers and dies for the sins of all the people. The story of Jesus' death therefore involved a profound shift in meaning from the tradition of the Old Testament. The name "Old Testament" reflects Christianity's understanding of itself as the fulfillment of Jeremiah's prophecy of a New Covenant (which is similar to "testament" and often conflated) to replace the existing covenant between God and Israel (Jeremiah 31:31). The emphasis, however, has shifted from