What does the book of Nahum teach about God's anger?

The book of Nahum emphatically communicates God's holiness and His right to exact vengeance. Nahum states that 'the Lord revengeth, and is furious' (Nahum 1:2), emphasizing that God holds a deep-seated anger against sin and unrepentant hearts. This portrayal of God's character contrasts sharply with modern interpretations that often emphasize only His love while ignoring His justice and holiness. The scripture underscores the nature of God as a consuming fire (Hebrews 12:29), reiterating that all unrighteousness elicits His wrath. Thus, Nahum serves as a dire warning to those who persist in their sin, revealing that God's anger is not a fleeting emotion but a righteous response to the rejection of His authority.