Charles H. Spurgeon on Psalms 83:6

The tabernacles of Edom. Nearest of kin, yet first in enmity. Their sire despised the birthright, and they despise the possessors of it. Leaving their rock built mansions for the tents of war, the Edomites invaded the land of Israel. And the Ishmaelites. A persecuting spirit ran in their blood, they perpetuated the old grudge between the child of the bondwoman and the son of the freewoman. Of Moab. Born of incest, but yet a near kinsman, the feud of Moab against Israel was very bitter. Little could righteous Lot have dreamed that his unhallowed seed would be such unrelenting enemies of his uncle Abraham's posterity. And the Hagarenes —perhaps descendants of Hagar by a second husband. Whoever they may have been, they cast their power into the wrong scale, and with all their might sought the ruin of Israel. Children of Hagar, and all others who dwell around Mount Sinai, which is in Arabia, are of the seed which gendereth to bondage, and hence they hate the seed according to promise.