Nahum prophesied about the downfall of Ninevah.
"The LORD is slow to anger, and great in power, and will not at all acquit the wicked: the LORD hath his way in the whirlwind and in the storm, and the clouds are the dust of his feet. He rebuketh the sea, and maketh it dry, and drieth up all the rivers: Bashan languisheth, and Carmel, and the flower of Lebanon languisheth." Nahum, 1:3-4.
God promised to overcome Ninevah and damn the sinners.
Whoever sins would be destroyed. Nahum lamented for the city because it was to suffer terribly. He warned the people to prepare for a plague and their destruction.
