In this verse he confirms what I have already said of oppressions: he says that they despised every thing right. But not to know this lessens not their guilt, as though they ignorantly offended; but the Prophet means, on the contrary, that they had cast away far from them everything that was just and allowed themselves all liberty in sinning, without any discrimination, without any shame; as though he said, "They are brute animals, who are void of all judgments of all reason, and of all shame; for they seek not to have a light understanding any more." here then he accuses the Israelites of wilful blindness; for they hardened themselves in every evil, and extinguished all judgments shame and reasons so that they no longer distinguished between what was just and unjust: and he mentions one thing in particular -- that they accumulated much wealth by plunder and robbery. The Israelites were no doubt guilty of many other crimes; but by stating a part for the whole, he mentions one thing which includes other things, and intimates, that the people were wholly given to all kinds of crimes, and that as they had cast aside every shame, obliterated every distinction, and repudiated every regard for justice, they abandoned themselves to every kind of wickedness. This, is the import of the Prophet's words. But our Prophet points out here the gross sins of the Israelites, because he had previously constituted the blind as their judges. Hence it was the same as though he had said, "Though the Egyptians and the Idumeans are void of light, yet your iniquity is so palpable, that they will be able to perceive it. There is indeed no necessity of any subtle disputation, since plunders and pillages are carried on with so much violence, since no moderation or equity is any longer observed, and no shame exists; but men rush headlong with blind impetuosity into every kind of evil; so that the very blind, though without eyes, can know what your state is. Then the Egyptians and Idumeans will perceive your vices, when located on the neighboring mountains." This is the meaning. It now follows --

For - (and) they know not to do right They "have not known," they have least all sense and knowledge, how "to do right" (literally, what is "straight-forward") because they had so long ceased to do it. It is part of the miserable blindness of sin, that, while the soul acquires a quick insight into evil, it becomes, at last, not paralyzed only to "do" good, but unable to perceive it. So Jeremiah says, "they are wise to do evil, but to do good they have no knowledge" Jeremiah 4:22. Whence of the Christian Paul says, "I would have you wise unto that which is good, and simple concerning evil" Romans 16:19. People, step by step, lose the power of understanding either good or evil, the love of the world or the love of God. Either becomes "a strange language" to ears accustomed to the "songs of Zion" or the din of the world. When our Lord and God came to His own, they said, "we know that God spake unto Moses: as for this man we know not whence He is" John 9:29. And this blindness was brought about by covetousness which "blindeth the eyes" even of "the wise" Exodus 23:8, as he adds;
Who store - (Literally, with indignation, "the storers"
With violence and robbery - They could not understand what was right, while they habitually did what was wrong. They "stored up," as they deemed, the gains and fruits; the robbery and injustice they saw not, because they turned away from seeing. But what is "stored" up, is not what wastes away, but what abides. Who doubts it? Then, what they treasured, were not the perishing things of earth, but, in truth, the sins themselves, as "a treasure of wrath against the Day of wrath and revelation of the righteous judgment of God" Romans 2:5. Strange treasure, to be so diligently accumulated, guarded, multiplied! Yet it is, in fact, all which remains. "So is he that layeth up treasure for himself and is not rich toward God" Luke 12:21. He adds, as an aggravation, "in their palaces." Deformed as in all oppression, yet to "oppress the poor, to increase his riches" Proverbs 22:16, has an unnatural hideousness of its own. What was wrung from the poor, laid up "in places!" Yet what else is it to cheapen luxuries at the cost of the wages of the poor?

For they know not to do right - So we may naturally say that they who are doing wrong, and to their own prejudice and ruin, must certainly be ignorant of what is right, and what is their own interest. But we say again "There are none so blind as those who will not see." Their eyes, saith the Lord, they have closed.

For they know not to do right, saith the LORD, who store up violence and robbery (l) in their palaces.
(l) The fruit of their cruelty and theft appears by their great riches, which they have in their houses.

For they know not to do right, saith the Lord,.... What is just and fight between man and man, no, not in one single instance; they did not regard it, or advert to it; they were under no concern about it; and were so much under the power of their lusts, that they knew not how to do it; and had used themselves so long to such wicked and unjust ways, that they had lost at least the practical knowledge of doing justice; they knew what was right in the theory, but not in the practice; bribes blinded their eyes; for this seems to design judges, civil magistrates, such who had the administration of justice and the execution Of the laws in their hands. The Targum is,
"they know not to execute the law;''
see Jeremiah 4:22;
who store up violence and robbery in their palaces; treasured up riches in their palaces, gotten in a violent way, by oppression and injustice; and which was no other, nor better, than robbery. This shows that persons in power and authority, that lived in palaces, in great splendour and grandeur, are here meant.

know not to do--Their moral corruption blinds their power of discernment so that they cannot do right (Jeremiah 4:22). Not simple intellectual ignorance; the defect lay in the heart and will.
store up violence and robbery--that is, treasures obtained by "violence and robbery" (Proverbs 10:2).

Store up - As men lay up wealth in their treasures, perverting judgment, first condemning the innocent, next seizing all his substance.