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 obsolete." Christians generally have the view that the New Covenant supersedes (i.e., replaces) the Old Testament's ritual laws, which includes many of the rules in Leviticus. Christians therefore have usually not observed Leviticus' rules regarding diet, purity, and agriculture. Christian teachings have differed, however, as to where to draw the line between ritual and moral regulations. Online versions of Leviticus: Related article: Brief introduction Book of Leviticus The Book of Leviticus () is the third book of the Torah and of the Old Testament. Most of its chapters (1–7, 11–27) consist of God's speeches to Moses, in which he is