This verse gives the reason of the refusal of Yahweh to hear the prophet's intercession. The punishment due has been delayed unto wearisomeness, and this seeming failure of justice has made Judah withdraw further from God.

I am weary with repenting - With repeatedly changing my purpose. I have often, after purposing to punish, showed them mercy. I will do it no longer; it is useless. I took them often at their promise, and in every instance they have failed.

Thou hast forsaken me, saith the Lord,.... His worship, as the Targum; and had set up idols, and idol worship; and this was the cause of the sword, pestilence, famine, and captivity, and of all the evils that befell them:

thou art gone backward; from the law of the Lord, and from his pure worship and service, from his ways and from his ordinances; and therefore it was but just they should go into captivity; hence it follows:

therefore will I stretch out mine hand against thee, and destroy thee; his hand of power and vengeance, which when stretched out, and falls with weight, whether on particular persons, or on a nation, brings inevitable ruin and destruction with it:

I am weary with repenting; not that the Lord ever changes his mind, or the counsel of his will; in this sense he is without repentance; but the conduct of his providence, and the dispensations of it; not executing the threatenings denounced, but sparing them a little longer, showing mercy, and exercising patience and longsuffering; but now he was as one weary and tired out, and was determined to bear no longer with them, but stir up all his wrath against them, and destroy them.

The reason of this treatment: because Jerusalem has dishonoured and rejected its God, therefore He now stretched out His hand to destroy it. To go backwards, instead of following the Lord, cf. Jeremiah 7:24. This determination the Lord will not change, for He is weary of repenting. הנּחם frequently of the withdrawal, in grace and pity, of a divine decree to punish, cf. Jeremiah 4:28, Genesis 6:6., Joel 2:14, etc.

Thou hast forsaken me, saith the LORD, thou art gone backward: therefore will I stretch out my hand against thee, and destroy thee; I am {e} weary with repenting.

(e) That is, I will not call back my plagues or spare you any more.

15:6 I am weary - I am resolved to bear no longer.

Margin repenting

See Scofield Note: "Zech 8:14"

6. weary with repenting-(Ho 13:14; 11:8). I have so often repented of the evil that I threatened (Jer 26:19; Ex 32:14; 1Ch 21:15), and have spared them, without My forbearance moving them to repentance, that I will not again change My purpose (God speaking in condescension to human modes of thought), but will take vengeance on them now.

15:1-9 The Lord declares that even Moses and Samuel must have pleaded in vain. The putting of this as a case, though they should stand before him, shows that they do not, and that saints in heaven do not pray for saints on earth. The Jews were condemned to different kinds of misery by the righteous judgment of God, and the remnant would be driven away, like the chaff, into captivity. Then was the populous city made desolate. Bad examples and misused authority often produce fatal effects, even after men are dead, or have repented of their crimes: this should make all greatly dread being the occasion of sin in others.