Then the chiefs of Edom will be dismayed; trembling will seize the leaders of Moab; those who dwell in Canaan will melt away,
Having read how that complete victory of Israel over the Egyptians was obtained, here we are told how it was celebrated; those that were to hold their peace while the deliverance was in working (Exo 14:14) must not hold their peace now that it was wrought; the less they had to do then the more they had to do now.
Commenting on Exodus 15:1-21
Then the dukes of Edom shall be amazed, Of which there were many, see Gen 36:15 the land being first governed by dukes, as perhaps it was at this time, though in some few years after it had a king, Num 20:14 now these, when they heard of the wonderful things that were done for Israel in Egypt, at the Red sea, and in the...
The dukes of Edom - Idumea was governed at this time by those called אלפים alluphim, heads, chiefs, or captains. See Clarke's note on Gen 36:15.