Matthew Poole and continuators on Judges 5:4

4 LORD, when thou wentest out of Seir, when thou marchedst out of the field of Edom , the earth trembled, and the heavens dropped, the clouds also dropped water .

Seir and Edom are the same place; and these two expressions note the same thing, even Gods marching in the head of his people from Seir or Edom, towards the Land of Canaan: Whilest the Israelites were encompassing Mount Seir, there were none of the following effects; but when once they had done that, and got Edom on their backs, then they marched directly forwards towards the Land of Canaan; the Prophetess being to praise God for the present Mercy, takes her rise higher, and begins her Song with the Commemoration of the former and ancient deliverances afforded by God to his people, the rather because of the great resemblance this had with them, in the extraordinary and miraculous manner of them.

Either, 1. The Inhabitants of the Earth or Land; or 2. The Earth, properly taken as the following passages are; God prepared the way for his People, and struck a dread into their Enemies, by Earthquakes, as well as by other Terrible Signs.

i. e. Thou didst send most dreadful Showers of Rain, Storms and Tempests, Thunder and Lightning, and other tokens of thy displeasure upon thine Enemies, as may appear by comparing this with other parallel Texts.

Marginal references: Deut. 33. 2.; Psal. 68. 8. Isa. 64. 1. Hab. 3. 10.