The book of Obadiah is a book of Prophetic Oracles. The prophet Obadiah wrote it. Its authorship is difficult to date but was possibly written about 853-841 B.C. or 605-586 B.C. The key personalities are the Edomites. The purpose of Obadiah is to show that God will judge all those who are against His children, His chosen people; Edom is used as the example of this truth.
Obadiah is only one chapter (the shortest book in the Old Testament) yet it tells of God's prophet Obadiah as he announces God's powerful and authoritative judgment on the nation of Edom. This is the fateful end of the nation of Edom. They had been in conflict with Israel since ancient times, in reality Edom is the descendants of Esau, Jacobs's brother.