What Is the Purpose of the Book of Deuteronomy?

Since it is primarily a teaching book, the purpose of Deuteronomy is to call Israel to covenant loyalty and obedience. Each subsequent generation of readers is, as it were, on the plains of Moab being reminded to love the Lord wholeheartedly and not to forget the God who graciously fulfills promises and longs for a personal relationship with His children. Israel was to prepare to claim God’s promises by being rooted in God’s Word and by abounding in love for Him and others.