The Book of Malachi is the last book of the Old Testament in the Bible. It is a prophetic text attributed to the prophet Malachi, whose name means "my messenger." The book addresses the spiritual and moral decline of the Israelites after their return from exile, emphasizing the need for repentance and faithfulness to God. Malachi contains four main sections, each presenting a dialogue between God and the people of Israel. Key themes include the importance of proper worship, the coming of a messenger, and the promise of a future day of judgment. The book ultimately calls for renewal and commitment to God's covenant.