A large part of the Deuteronomy consists of three sermons delivered by Moses reviewing the previous forty years of wandering in the wilderness, and the future entering into the Promised Land. Its central element is a detailed law-code by which the Israelites are to live within the Promised Land.
Theologically the book constitutes the renewing of the covenant between YHWH, the Jewish God, and the "Children of Israel".
One of its most significant verses is considered to be Deuteronomy 6:4, which constitutes the Shema, a definitive statement of Jewish identity: "Hear, O Israel: the LORD (YHWH) (is) our God, the LORD is one."