Judges 5:4

Edom — Seir and 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: while 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 forward towards the land of Canaan. The prophetess being to praise God for the present mercies, takes her rise higher, and begins her song with the commemoration of the ancient deliverances afforded by God to his people, the rather because of the great resemblance this had with them, in the miraculous manner of them. The earth trembled — God prepared the way for his people, and struck a dread into their enemies, by earth — quakes as well as by other terrible signs. Dropped water — That is, thou didst send storms and tempests, thunder and lightning, and other tokens of thy displeasure upon thine enemies.