The book of Deuteronomy is an Old Testament book commonly identified as the farewell speech of Moses to the people of Israel just before his death. The title of the book comes from the Greek word ‎Deuteronomion‎, which means "second law." In his address, Moses underscored and repeated many of the laws of God that the people received at Mount Sinai about 40 years earlier. 

In the final speech format it's the report on Moses' death and the selection of Joshua as his successor.  In his addresses, Moses reminded the people of their days of slavery in Egypt and how God had delivered them safely through the wilderness to the borders of the Promised Land. He also restated the Ten Commandments and indicated that these great moral principles should direct their lives. As God's special people, they were to be holy and righteous as an example for surrounding pagan nations.