Nahum uses a metaphor to describe the former glory of Nineveh, but when it comes to her judgment in verse 13, she is addressed in plainer language. Like a pride of lions, fearing no one and doing as they please, and causing fear to fall on all around them, so, once, was Nineveh.
God’s triumph over his enemies needs to be emphasised, because they have so long prevailed, and they have exercised such cruelty, and their confidence and haughtiness has grown so great, and it has seemed so impossible that their tyranny should ever end. When he brings them down, it is a cause of unrestrained rejoicing. God’s justice is righteous and perfect, and nothing about it is exaggerated or vindictive. He does not punish any more than evil deserves, nor any less.
Great changes are brought about by God, changes which man could never imagine. The prophets emphasise the extent of the downfall of human pride, because it is lifted up so high, and is such an ugly thing and an aberration in his creation. As the Lord looks across the landscape of the earth, it is as if he sees something which rises up high above the rest and draws attention to itself, and which should not be there. It is human pride, and all human pride will be laid low. Let us ‘humble [ourselves] therefore under the mighty hand of God, that he may exalt [us] in due time’ (1 Peter 5:6).
Assyria had been raised up by God to be a scourge of the nations (Isaiah 10:5-7; 2 Kings 19:17-18) and of kingdom of Israel in the north (2 Kings 17:7-18), which fell in 722 BC and was taken into exile (2 Kings 17:23). Later Sennacherib had threatened Judah also, but God had answered the prayers of Hezekiah, and the Assyrian host was destroyed (2 Kings 19:35). Sennacherib had returned home in shame and had been murdered by his children (2 Kings 19:37). But after all this, and after Assyria had served God’s purpose, she too was to be cast down (2 Kings 17:7-18).