God Is Not Changing.

The ratification of all this: For I am the Lord; I change not; therefore you sons of Jacob are not consumed. Here we have, God's immutability asserted by Himself, and glorified in: "I am the Lord; I change not; and therefore no word that I have spoken shall fall to the ground." Is God a just revenger of those that rebel against him? Is he the bountiful rewarder of those that diligently seek him? In both these he is unchangeable. Though the sentence passed against evil works be not executed speedily, yet it will be executed, for he is the Lord; he changes not; he is as much an enemy to sin as ever he was, and impenitent sinners will find him so. There needs no scire facias-a writ calling one to show cause, to revive God's judgment, for it is never antiquated, or out of date, but against those that go on still in their trespasses the curse of his law still remains in full force, power, and virtue.

A particular proof of it, from the comfortable experience which the people of Israel had had of it. They had reason to say that he was an unchangeable God, for he had been faithful to his covenant with them and their fathers; if he had not adhered to that, they would have been consumed long ago and cut off from being a people; they had been false and fickle in their conduct to him, and he might justly have abandoned them, and then they would soon have been consumed and ruined; but because he remembered his covenant, and would not violate that, nor alter the thing that had gone forth out of his lips, they were preserved from ruin and recovered from the brink of it. It was purely because he would be as good as his word, Deuteronomy 7:8; Leviticus 26:42. Now as God had kept them from ruin, while the covenant of peculiarity remained in force, purely because he would be faithful to that covenant, and would show that he is not a man that he should lie (Numbers 23:19), so, when that covenant should be superseded and set aside by the New Testament, and they, by rejecting the blessings of it, lay themselves open to the curses, he will show that in the determinations of his wrath, as well as in those of his mercy, he is not a man, that he should repent, but will then be as true to his threatenings as hitherto he had been to his promises; see 1 Samuel 15:29. We may all apply this very sensibly to ourselves; because we have to do with a God that changes not, therefore it is that we are not consumed, even because his compassions fail not; they are new every morning; great is his faithfulness, Lamentations 3:22, 23. - Matthew Henry