The hills did tremble; a metaphorical and hyperbolical description of a grievous calamity, familiar in the prophets, as Isaiah 64:1,2 Jer 4:24, and in other authors. His hand is stretched out still, ready to give you another and a sorer blow. This is not the end, as you vainly imagine, but, if you repent not, the beginning, of your sorrows, and an earnest of further calamities.
Related Commentaries of Isaiah 5:25
Isaiah 5:25
25 Therefore is the anger of the LORD kindled against his people, and he hath stretched forth his hand against them, and hath smitten them: and the hills did tremble, and their carcases were torng in the midst of the streets. For all this his anger is not turned away, but his hand is stretched out still.