Nahum 1:2

(Vers. 2.) The Lord is patient and of great strength, and cleansing, He will not make the innocent. The more significant translation in Greek is: καὶ ἀθωῶν οὐκ ἀθωώσει ((Al. καὶ ἀθοῶν οὐκ ἀθοώσει)). And the meaning is: Indeed, the Lord has been patient with the wickedness of the Assyrians and has endured their injustices with the strength of His magnanimity, calling them to repentance.

God is jealous and the Lord avenges; the Lord avenges with wrath; the Lord avenges his adversaries, and he cuts off his enemies. The Lord is long-suffering and his strength is great, and he will by no means clear the guilty. The saying is profound, and not easy to grasp, except only for those who are willing to examine closely the things in it. And if it should be understood as having been directed to the Jews, we will find the exhortation suitably mixed with moderate rebuke. But if someone should think it was made and spoken against Nineveh, the mind will be turned to another of the interpretations, and to those who have suffered the devastation it gives and confirms the hopes of recovering again. We shall therefore make the purpose of the meaning for both as clear as possible. For the Jews, having spurned love for God, and holding the genuineness of piety toward Him in no account whatsoever, descended into polytheism and strange error and a life outside the law, and they built altars, they set up precincts to the works of their own hands, they brought rites and sacrifices to Astarte, to Chemosh, to Baal-peor, to the golden calves, and what is even more irrational than these, to them they dedicated songs of thanksgiving. For the wretched ones said out of their madness, "These are your gods, Israel, who brought you up out of the land of Egypt." But by such terrible impious acts they have forgotten themselves, sharpening against themselves the God who of old presided over and saved them, to whom they have become enemies, and have been placed in the portion of adversaries, assigning themselves to gods that are not so by nature, although Moses long ago cried out concerning God, that He is a jealous God, and a consuming fire, and that He would not endure those who chose to grieve Him.

A particular application of this (as most interpreters think) to the destruction of Sennacherib and the Assyrian army, when they besieged Jerusalem, which was a very memorable and illustrious instance of the power both of God's justice and of his mercy, and spoke abundance of terror to his enemies and encouragement to his faithful servants,

God is jealous, and the Lord revengeth,....

God is jealous - For his own glory. And - revengeth - His justice; by the destruction of his enemies. And is furious - So powerful in the manifestations of his judgments, that nothing can stand before him. He reserveth wrath - Though they seem to prosper for a time, and God appears to have passed by their crimes without notice, yet he reserveth - treasureth up - wrath for them, which shall burst forth in due time.