The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Book Introduction - Obadiah
Internal evidence seems to fix the date of Obadiah's ministry in the reign of the bloody Athaliah Kg2 8:16-26. If this be true, and if the ministry of Joel was during the reign of Joash, then Obadiah is chronologically first of the writing prophets, and first to use the formula, "the day of the Lord." (Cf.).
See Scofield - Joe 1:4) .
The book is in four parts:
1. Edom's humiliation (Obadiah 1:1-9).
2. The crowning sin of Edom (Obadiah 1:10-14).
3. The future visitation of Edom in the day of the Lord, (Obadiah 1:15-16) (Isaiah 34.). Isa 63:1-6.
4. The inclusion of Edom in the future kingdom (Obadiah 1:17-21); Num 24:17-19.