And the Lord shall be seen over them - o “He will reveal himself,” protecting them. Cyril: “He says plainly, that the Lord God will be with them and will fight in serried array with them and will with them subdue those who resist them.” It is as if he would say, “When they go forth and preach everywhere, the Lord shall work with them and confirm the word with signs following” Mark 16:20. “And His arrow shall go forth as the lightning.” Habakkuk directly calls the lightnings the arrows of God: “at the light of Thine arrows they went” . Here it is probably of an invisible agency, and so compared to that awful symbol of His presence, the lightning.
And the Lord God shall blow with the trumpet - As their Commander, ordering their goings. The blowing of the trumpet by the priests in war was commanded, as a reminiscence of themselves before God, “If ye go to war in your land against the enemy that oppresseth you, then ye shall blow an alarm with the trumpets, and ye shall be remembered before the Lord your God, and ye shall be saved from your enemies” Numbers 10:9. Abijah said, “God Himself is with us for our captain, and His priests with sounding trumpets to cry alarm against you” 2 Chronicles 13:12.
And shall go with whirlwinds of the south - As being the most vehement and destructive. So Isaiah, “As whirlwinds in the south sweep by, He cometh from a desert, from a terrible land” Isaiah 21:1. Such smote the four corners of the house where Job’s children were , and they perished.