Edom are the same place; and these two expressions note the same thing, even God’s marching in the head of his people from Seir or Edom towards the land of Canaan. Whilst 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.
The earth; 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.
The clouds also dropped water, 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.