1-8: This is a description of God's character as a judge. His jealousy is justified the same way a husband is justified when his unfaithful wife causes him to be jealous. In Hosea we see that God's relationship with Israel is likened to a marriage. Though the Lord is slow to anger, no one can remain standing when his wrath is poured out. However, those who take refuge in him by trusting in Jesus' atoning work are protected.
9-14: God promises he will destroy his enemies, Israel's oppressors.
1-13: God promises the destruction of Nineveh and describes soldiers with chariots defeating them. Some believe Nahum is speaking about the Babylonians. God makes it clear that he is against the nation and promises he will destroy them.
1-4: God destroyed Nineveh for plundering and shedding the blood of other nations. He used the Babylonians to destroy them in 612 BC.
5-7: God exposed the evil and shame of Nineveh to other nations.
8-19: He continues to pronounce judgement on the city and tells them to prepare, though in vain, for destruction.