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
Leviticus 19 (26-36) and a general instruction to obey all of God's commands (37). The laws of Leviticus 19 are put in no obvious order, and as a result scholars tend to think that the chapter includes a collection of regulations from various sources. The practice of leaving a portion of crops in the field for poor people or foreigners to use, mentioned in verses 9 and 10, reappears in the second chapter of the book of Ruth. In Judaism, the whole chapter is part of the weekly Torah portion (parashah) "Kedoshim" () which comprises Leviticus 19:1-20:27. Leviticus 19 Leviticus 19 is