Joram went over to Zair - This is the same as Seir, a chief city of Idumea. So Isaiah 21:11; : The burden of Dumah (Idumea). He calleth to me out of Seir.
Smote the Edomites - It appears that the Israelites were surrounded by the Idumeans; and that in the night Joram and his men cut their way through them, and so got every man to his tent, for they were not able to make any farther head against these enemies; and therefore it is said, that Edom revolted from under the hand of Judah unto this day.
Zair - Perhaps Seir, the famous mountain of Edom Genesis 14:6.
The people - i. e., The Edomites. Yet, notwithstanding his success, Joram was forced to withdraw from the country, and to leave the natives to enjoy that independence 2 Kings 8:22, which continued until the time of John Hyrcanus, who once more reduced them.