John Gills Exposition of the Bible Commentary - Nahum 1:5
The mountains quake at him, and the hills melt ,.... As Sinai of old did, when the Lord descended on it, Exodus 19:18 . Mountains figuratively signify kings and princes; and hills large countries, as Jarchi and Abarbinel observe, and the inhabitants of them; particularly the kingdoms and nations belonging to the Assyrian empire, which would tremble and quake, and their hearts melt with fear, when they should hear of the destruction of Nineveh their chief city; and of the devastation made... read more
Matthew Henry's Complete Commentary - Nahum 1:2-8
Nineveh knows not God, that God that contends with her, and therefore is here told what a God he is; and it is good for us all to mix faith with that which is here said concerning him, which speaks a great deal of terror to the wicked and comfort to good people; for this glorious description of the Sovereign of the world, like the pillar of cloud and fire, has a bright side towards Israel and a dark side towards the Egyptians. Let each take his portion from it; let sinners read it and tremble;... read more