If there’s a more potent description of God than in Nahum chapter 1, I haven’t found it yet. Approximately a century after Jonah reluctantly prophesied to Nineveh about their judgment, securing their repentance (remember how disgusted Jonah was about that?), Assyria ended up ransacking Judah as a tool of God’s judgment after all. Unfortunately for the Gentile nation, they plotted against God (Nahum 1:9-11); they suppressed and hated the knowledge Yahweh graciously gave them regarding Himself.
But as Jesus would say about the Israel’s leaders during His ministry on earth,
And that slave who knew his master’s will and did not get ready or act in accord with his will, will receive many lashes, but the one who did not know it, and committed deeds worthy of a flogging, will receive but few. From everyone who has been given much, much will be required; and to whom they entrusted much, of him they will ask all the more. –Luke 12:47-48
Non-Christians, receivers of lots of revelation about God, will answer for their lack of response to that revelation.
Matthew Henry wrote, “Never was the glorious Majesty of heaven and earth more daringly, more blasphemously affronted than by Sennacherib at that time. He was a wicked counsellor who counselled them to despair of God’s protection, and surrender themselves to the king of Assyria.”
So God announced through Nahum,
God is jealous, and the Lord avenges;
The Lord avenges and is furious.
The Lord will take vengeance on His adversaries,
And He reserves wrath for His enemies;
The Lord is slow to anger and great in power,
And will not at all acquit the wicked.
Who can stand before His indignation?
And who can endure the fierceness of His anger?
…His fury is poured out like fire,
And the rocks are thrown down by Him.
The Lord is good,
A stronghold in the day of trouble;
And He knows those who trust in Him.
But with an overflowing flood
He will make an utter end of its place,
And darkness will pursue His enemies.
God is jealous, and Jehovah will have His revenge. The vengeance of God is the deliverance of the world from oppression and misery brought about by sin. His patience is great, but a day is coming which will show the world that He doesn’t bear with evil — exactly the encouragement we can use these days.