Oba 1:3
Oba 1:3 contains a consequence which follows from Oba 1:2. Edom will be unable to avert this fate: its lofty rocky castles will not preserve it from the overthrow which has been decreed by the Lord, and which He will carry out through the medium of the nations. Edom has therefore been deceived by its proud reliance upon these rocky towers. שׁכני, which the connecting sound י attached to the construct state (see at Gen 31:39), is a vocative. הגוי סלע are rocky towers, though the primary meaning of חגוי is open to dispute. The word is derived from the root חגה, which is not used in Hebrew (like קצוי from קצה), and is found not only here and in the parallel passage of Jeremiah, but also in the Sol 2:14, where it occurs in parallelism with סתר, which points to the meaning refugium, i.e., asylum. This meaning has also been confirmed by A. Schultens (Anim-adv. ad Jes. xix. 17) and by Michaelis (Thes. s.v. Jes.), from the Arabic ḥj'a, confugit, and maḥjâ'u, refugium.
In the expression מרום שׁבתּו the ב is to be considered as still retaining its force from חגוי onwards (cf. Isa 28:7; Job 15:3, etc.). The emphasis rests upon high; and hence the abstract noun mârōm, height, instead of the adjective. The Edomites inhabited the mountains of Seir, which have not yet been carefully explored in detail. They are on the eastern side of the Ghor (or Arabah), stretching from the deep rocky valley of the Ahsy, which opens into the southern extremity of the Dead Sea, and extending as far as Aela on the Red Sea, and consist of mighty rocks of granite and porphyry, covered with fresh vegetation, which terminate in the west, towards the deeply intersected sand-sea of the Ghor and Arabah, in steep and lofty walls of sandstone. The mountains are hardly accessible, therefore, on the western side; whereas on the east they are gradually lost in the broad sandy desert of Arabia, without any perceptible fall (see Burckhardt in v. Raumer’s Pal. pp. 83-4, 86; and Robinson’s Palestine, ii. p. 551ff.). They also abound in clefts, with both natural and artificial caves; and hence its earliest inhabitants were Horites, i.e., dwellers in caves; and even the Edomites dwelt in caves, at least to some extent.
The capital, Sela (Petra), in the Wady Musa, of whose glory at one time there are proofs still to be found in innumerable remains of tombs, temples, and other buildings, was shut in both upon the east and west by rocky walls, which present an endless variety of bright lively colours, from the deepest crimson to the softest pale red, and sometimes passing into orange and yellow; whilst on the north and south it was so encircled by hills and heights, that it could only be reached by climbing through very difficult mountain passes and defiles (see Burckhardt, Syr. p. 703; Robinson, Pal. ii. p. 573; and Ritter, Erdk. xiv. p. 1103); and Pliny calls it oppidum circumdatum montibus inaccessis. Compare Strabo, xvi. 779; and for the different roads to Petra, Ritter, p. 997ff.