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 Leviticus traditionally the first book taught to children in the Rabbinic system of education. There are two main Midrashim on Leviticus—the halakhic one (Sifra) and a more aggadic one (Vayikra Rabbah). The New Testament, particularly the Epistle to the Hebrews, uses ideas and images from Leviticus to describe Christ as the high priest who offers his own blood as a sin offering. Therefore, Christians do not make animal offerings either, as Gordon Wenham summarized: "With the death of Christ the only sufficient "burnt offering" was offered once and for all, and therefore the animal sacrifices which foreshadowed Christ's sacrifice were made