One chapter, one verdict — pride comes down from the high places.
"As thou hast done, it shall be done unto thee: thy reward shall return upon thine own ______."
Obadiah is the shortest book in the Old Testament — twenty-one verses, one chapter, no mercy for Edom.
The whole book is aimed at Edom — the nation descended from Esau — for standing by, and then joining in, when Jerusalem fell. A family grudge a thousand years old.
Edom's capital was carved into cliffs — 'thou that dwellest in the clefts of the rock.' Many identify it with Petra, the stone city you've seen in photographs.
At least a dozen men in the Old Testament are named Obadiah — 'servant of the LORD' — and we know almost nothing about which one wrote this. Perfect for our hardest tier.