With only 21 verses, Obadiah is the shortest book in the Old Testament, and yet it is a complete message with the twin prophetic themes of condemnation (1–16) and consolation (17–21; the consolation portion concerns Judah, not Edom). The burden of Obadiah is a pronouncement of inescapable doom upon the Edomites (Esau) because they looked down on their brother Judah (Jacob) in the day of his misfortune and rejoiced over the people of Judah in the day of their disaster (12–14). The Edomites’ pride will be brought low (3–4), and they will be ransacked (6), terrified (9), and obliterated (10). Israel, on the other hand, will be restored, and it will possess its inheritance (17–21).
From Handbook Handbook to Scripture: 365 Key Chapters in the Bible https://kenboa.org/product/handbook-to-scripture-365-key-chapters-in-the-bible/
"Teach us to number our days, that we may gain a heart of wisdom."