John Trapp on Habakkuk 3:10

Verſe 10. The mountains ſaw thee, and they trembled] ſc. At the promulgation of the Law, Exod. 19.17. Pſal. 114.4, 6. when God came with ten thouſand of his Saints, Deut. 33.2. and ſo terrible was the earth-quake, that it wrought an heart-quake, even in Moſes himſelf, Heb. 12.21. It is the office of the Law to do ſo: and happy is he, who terrified, and thunder-ſtruck by the threats thereof, runnes to Chriſt for refuge, as to One who is able to ſave to the utmoſt them that come unto God by him, Heb. 9.25. Some take mountains metaphorically, for the Mighties of the earth, and read it thus. The mountains ſaw thee, and they grieved. See Num. 22.3. Joſh. 2.9, 10, 11

The over-flowing of the water paſſed by] the inundation of Jordan paſſed into the dead-ſea, the lower part of it, I mean: like as the upper ſtood, and roſe up upon an heap,Gualth. Joſh. 3.16. being bounded and barred up by the Almighty power of God.

the deep uttered his voice; and lifted up his hands on high] i. e. ſummo conſenſis ſuffragatus eſt, &c. It voiced, and voted for Gods judgements; helping forward the execution thereof.