The Book of the Lord is a phrase that begins the last portion of Scripture, focusing on the judgment on the Day of the Lord. The text underscores man's struggle to believe in and prepare for such judgement. Neither Judah nor the Northern tribes of Israel could appropriately identify the truth in the Book of the Lord. Today, Jesus Christ and the Apostles carry the task of issuing judgement upon nations. The text warns against ignoring this divine retribution.