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24. The Lord of hosts hath sworn. For more full confirmation an oath was necessary. There is nothing of which it is more difficult to convince us than that wicked men will immediately be ruined, when we see them flourishing, and furnished with all means of defense, and seemingly placed out of danger, and free from all fear. We are therefore stunned by beholding them, and are dazzled by their brightness, so that we can scarcely believe God when he foretells their ruin and destruction. On this account he employs an oath, that he may leave no room for doubt. Hence we learn how great is his forbearance towards us, when he aids our weakness by applying this remedy, for otherwise he might have been satisfied with simply declaring it. This tends to the consolation of the godly, as we shall afterwards see. (Isaiah 22:14.)

If it hath not been as I thought. The elliptical form of an oath which he employs must be well known, for it occurs frequently in Scripture. The Lord purposely used this guarded language, that we might not be too free in the use of oaths, which burst from us daringly and at random. He suppresses the greater part of the oath. “If I shall not do what I have decreed, let men think that I am a liar, and let them not think that I am God;” or something of this kind (which we shudder to express) is left to be supplied. Men ought, therefore, to lay a bridle on themselves, so as not to break out at random into imprecations, or to pronounce shocking curses against themselves; but let them learn from this to restrain their insolence.

25. That I may bruise the Assyrian in my land. Some think that this relates to Sennacherib’s army, which the hand of God destroyed by means of an angel, when he besieged Jerusalem. (2 Kings 19:35; Isaiah 37:36.) If this interpretation be preferred, the meaning will be, that the Lord will shortly give some evidence of that destruction which he has threatened against the Babylonians. Those who heard these predictions might have brought this objection: “Of what avail will it be to us that Babylon is destroyed, after Babylon has ruined us? Would it not have been better that both Babylon and we had remained uninjured? What consolation will be yielded to us by its destruction, when we, too, shall have been destroyed?” And, indeed, I have no doubt that he holds out a proof of God’s favor in destroying their enemies, which either had been already manifested, or would be manifested soon afterwards.

I dare not affirm at what time this prediction was uttered by the Prophet, but it may be conjectured with some probability that the slaughter of Sennacherib’s army by the angel had already taken place. In this way, from a striking event which they had known, the Prophet would lead them to expect a future redemption; as if he had said, “You have already perceived how wonderfully God assists his people at the very hour of danger.” I am thus prepared to assign a reason for thinking that Sennacherib’s army had been already slain. Undoubtedly this instruction must have been of some use.

But Babylon did not begin to give any annoyance to the Jews before she had subdued the Assyrians and renewed the monarchy. So long, therefore, as the Jews had nothing to do with Babylon, why did the Prophet speak of the judgment of God, by which he would avenge his people? There is no absurdity in supposing that the record of a past event is confounded with a prediction. And yet it will not be inadmissible to say that the Assyrians are here put for the Chaldeans; for though they had been deprived of the government, yet it is probable that they were always first in a state of readiness whenever there was an opportunity of attacking the Jews, and that, while they fought under foreign leaders, they formed the greater part of the army. Not only were they nearer than the Chaldeans, but those who at that time held the sway were aware that their inveterate hostility against the Jews would make them loyal and obedient in that war. Besides, it was advantageous to the conquerors to weaken the vanquished by continual wars, till they had been accustomed to bear the yoke.

Most appropriately, therefore, by a figure of speech in which a part is taken for the whole, Isaiah, though he is speaking of Babylon, describes the whole of its forces under the name of Assyria. There will thus be no argument which lays us under the necessity of explaining this passage as relating to the slaughter effected by the angel in Sennacherib’s army. The Prophet merely affirms, so far as my judgment goes, that the Lord will put an end to the tyranny of the Assyrians, so that they shall not always enjoy their present superiority. As if he had said, “Though for a time God permits wicked men to rule over you, this power will not always last; for one day he will, as it were, break the yoke, and deliver this people from this bondage under which they groan.” The Assyrians, though they were vanquished by the Chaldeans, did not on that account, as we have said, cease to be enemies of the Church; but Babylon, which had succeeded in the room of Nineveh, began at that time, by a kind of transferred right, to carry on war with the Jews.

And his yoke shall depart from them, and his burden shall be taken from their shoulder. When he says that the Assyrian will be broken in Judea, this must not be understood as if they would be slain there, or that they would be instantly crushed by some calamity; but that the chosen people would be delivered from their tyranny, and that their authority would thus be taken away. The breaking, therefore, does not refer so much to persons as to the empire. What he says about the yoke and the burden would not apply strictly to the Assyrians alone, who at least never were masters of the city of Jerusalem; and therefore we must attend to the succession which I mentioned, for the Chaldeans had no right to carry on war except that right which they boasted of as having been conveyed to them by the Assyrians. Thus I think that I am justified in extending this prophecy to that deliverance by which the Lord showed that he would avenge his people against the Chaldeans and Assyrians; for at that time the yoke was shaken off by which the Jews were miserably held bound, and it even includes the redemption obtained through Christ, of which that deliverance was a forerunner.

And upon my mountains I will tread him under feet. Some think that the word mountains is put in the plural number for Mount Zion; but I prefer a different interpretation. Jerusalem being situated among the mountains, the whole country around was despised for that reason. The Prophet therefore speaks contemptuously, as if he admitted that the country was regarded by the enemies as of little value because it was mountainous. But this very contempt serves to magnify the power of God; for he shakes off from his mountains the dominion of this powerful monarchy. This refers to the narrative contained in 1 Kings 20:23, 28

26. This purpose which is purposed upon the whole earth. The Lord is not satisfied with one or two confirmations, and can scarcely refrain from proclaiming it more and more abundantly, because he knows well that our minds are naturally prone to distrust. No confirmation suffices for us, even though his promises be frequent and copious and solemn. God therefore wishes to remedy this disease, and that is the design of the repetition, so that we must not think that it is superfluous. They who suppose that the Prophet, or rather the Spirit of God, uses too many words, are not well acquainted with themselves.

He declares, first, the will and purpose of God, and, secondly, his power. How comes it that we have any doubts about the word, but because we do not ascribe to God that power which belongs to him, or because we are not convinced of his power? These are the only two causes of our unbelief, with which, on the other hand, we ought to contrast the two things which Isaiah recommends to our notice, namely, the purpose and the power of God. We ought to believe, first, that God is true, for he declares nothing that is not fixed and unchangeable; and, secondly, that he is powerful, and that nothing can withstand his arm. Again, we must not inquire about the secret purpose of God: for the Prophet here enjoins us to rest satisfied with the decree which has been manifested in the word of God. We must not rise any higher, therefore, so as to penetrate into the secrets of God; but we ought to be satisfied with undoubted proofs which he declares by the mouth of the prophets. Let us therefore embrace all the promises of God with our whole heart, and let us also add to them his power; for his hand ought never to be separated from his mouth. We must not imagine his power to be, as philosophers talk, a power that is unemployed, but, as the Scriptures teach us, powerful and active.

A question may here arise, Why does he mention the whole earth and all the nations, when he is only speaking about Babylon? But we must keep in remembrance what we formerly said, that the Babylonian empire, after having swallowed up Nineveh, extended nearly through the whole of the east, and that various nations were subject to it. The consequence was, that the devastation of that empire was also the destruction of the whole world; for such great monarchies cannot fall without involving many in an extensive ruin. Accordingly, as the extent of that empire might lead men to call in question this prophecy, Isaiah shows that, though it be spread far and wide, and includes a boundless multitude of nations, that does not prevent God from executing his decree.

27. For the Lord of hosts hath decreed. Isaiah here employs what may be regarded as a concluding exclamation, to confirm more fully the preceding statement. Having said that it is the purpose of the Lord, in order to show that it cannot be broken or made void, (Psalm 33:11,) he puts a question as if about a thing impossible, Who shall disannul his purpose? or, who shall turn back his hand? By this exclamation he speaks disdainfully of all the creatures; for as soon as the Lord has decreed, he stretches out his hand, and when his hand is stretched out, the execution of the work must undoubtedly follow. Nor is it only men whom he declares to be incapable, but he also declares everything else to be incapable of preventing the decree of God; at least if there be anything but man and Satan that opposes his will. In short, he intimates that there can be no repentance or change in God, (Numbers 23:19,) but that whatever may happen, even amidst an endless diversity of events, he continues always to be like himself, and that no occurrence can thwart his purpose.

If it be objected that God sometimes changed his purpose, as when he spared the Ninevites, (Jonah 1:2, 3:10,) Abimelech, (Genesis 20:3, 17,) or Pharaoh, (Genesis 12:17,) the answer is easy. When the Lord sent Jonah to the Ninevites, he did not reveal what had been decreed in his secret purpose, but wished to arouse their minds by the preaching of Jonah, that he might have compassion on them. The same thing might be said, when he threatened Abimelech and Pharaoh, because they wished to lay hands on Abraham’s wife; for thus the Lord, by terrifying them, intended to keep them back, that they might not suffer the punishment of their obstinacy.