The tabernacles of Edom - The tents of Edom; meaning here, the dwellers in those tents, that is, the Edomites. The word tabernacles or tents does not necessarily imply that the nation then led a wandering life, for the word came to signify in process of time a dwelling-place, or a habitation. The Edomites were not, in fact, a roving and wandering people, but a people of fixed boundaries. In early periods, however, like most ancient people, they doubtless dwelt in tents. Edom, or Idumea, was south of Palestine. See the notes at Isaiah 11:14.
And the Ishmaelites - The descendants of Ishmael. They dwelt in Arabia Deserta.
Of Moab - On the situation of Moab, see the notes at Isaiah 15:1-9. It was on the southeast of Palestine.
And the Hagarenes - The Hagarenes were properly Arabs, so called from Hagar, the handmaid of Abraham, the mother of Ishmael. Genesis 16:1; Genesis 25:12. As connected with the Ishmaelites they would naturally join in this alliance.