He confirms the former sentence, -- that the Idumeans in vain trusted that their riches would be safe, because they had hidden and deep recesses. Even when a country is plundered by enemies, the conquerors dare not to come to places of danger; when there are narrow passes, they avoid them, for they think that there is there some evil design. Hence conquerors, fearing hidden places, plunder only those which are open, and always consider well whether their advance is safe: but Idumea, as we have said, had hidden recesses, for its rocks were almost inaccessible, and there were many conveniences there for hiding and concealing its riches. But the Prophet says, that all this would be useless: and that he might more effectually rouse them, he speaks with astonishment, as of something incredible. How have been sought the things of Esau, and thoroughly searched his hidden places! Who could have thought this? for they might have concealed their treasures in rocks and caverns, and thence repelled their enemies. But in vain would be all their attempts: how could this possibly be? Here then he awakens the minds of men, that they might acknowledge the judgment of God; and at the same time he laughs to scorn the vain confidence with which the Idumeans were inflated; and besides, he strengthens the minds of the godly, that they might not doubt but that God would perform what he declares, for he can indeed penetrate even to the lowest deep. In short, the Prophet intimates that the faithful did not act wisely, if they measured God's vengeance, which was impending on the Idumeans, by their own understanding or by what usually happens; for the Lord would make a thorough search, so that no hiding-places would escape his sight; and then all their treasures would be exposed as a prey to their enemies. We hence learn, that as men in vain seek hiding places for themselves that they may be safe from dangers; so in vain they conceal their riches; for the hand of God can penetrate beyond the sea, land, heaven, and the lowest deep. Nothing then remains for us but ever to offer ourselves and all our things to God. If he protects us under his wings, we shall be safe in the midst of innumerable dangers; but if we think that subterfuges will be of any avail to us, we deceive ourselves. The Prophet now adds --

How are the things of Esau searched out! - literally, "How are Esau, out searched!" i. e., Esau, as a whole and in all its parts and in all its belongings, all its people and all its property, one and all. The name "Esau" speaks of them as a whole; the plural verb, "are outsearched," represents all its parts. The word signifies a diligent search and tracking out, as in Zephaniah Zephaniah 1:12, "I will search out Jerusalem with candles," as a man holdeth a light in every dark corner, in seeking diligently some small thing which has been lost. "The hidden things," i. e., his hidden treasures, "are sought up." The enemy who should come upon him, should make no passing foray, but should abide there, seeking out of their holes in the rocks, themselves and their treasures. Petra, through its rocky ramparts, was well suited, as Nineveh in the huge circuit of its massive walls was well built, to be the receptacle of rapine.
And now it was gathered, as rapine is, first or last, for the spoiler. It was safe stored up there, to be had for the seeking. No exit, no way of escape. Edom, lately so full of malicious energy, so proud, should lie at the proud foot of its conqueror, passive as the sheep in this large shamble, or as the inanimate hoards which they had laid up and which were now "tracked out." Soon after Obadiah's prophecy, Judah, under Ahaz, lost again to Syria, Elath 2-Kings 14:6, which it had now under Uzziah recovered 2-Kings 14:22. The Jews were replaced, it is uncertain whether by Edomites or by some tribe of Syrians. If Syrians, they were then friendly; if Edomites, Elath itself must, on the nearby captivity of Syria, have become the absolute possession of Edom. Either way, commerce again poured its wealth into Edom. To what end? To be possessed and to aggrandize Edom, thought her wealthy and her wise men; to be searched out and plundered, said the word of God. And it was so.

How are the things of Esau searched out!.... Or how are the Esauites, the posterity of Esau, sought out! though they dwelt in the clefts of the rocks, and hid themselves in caves and dens, yet their enemies searched them, and found there, and plucked them out from thence, so that none escaped:
how are his hid things sought up! his riches, wealth and treasure, hid in fortresses, in rocks and caves, where they were thought to be safe, and judged inaccessible; or that an enemy would not have ventured in search of them there; and yet these should be sought after and found by the greedy, and diligent, and venturous soldier, and carried off; which was the case of the Edomites by the Chaldeans, and will be of the antichristian states by the kings of the earth, Revelation 17:16; see Jeremiah 49:10.

How are the things of Esau searched out!--by hostile soldiers seeking booty. Compare with here, .
hidden things--or "places." Edom abounded in such hiding-places, as caves, clefts in the rock, &c. None of these would be left unexplored by the foe.

Esau - The father of this people, put for his posterity. Sought up - All that the Edomites had laid up in the most secret places, are seized and brought forth by soldiers.