Numbers 24:18

And Edom shall be a possession
Of the children of Israel, which was fulfilled in part when the Edomites became the servants of David, ( 2 Samuel 8:14 ) and when they were smitten and spoiled by Judas Maccabeus,

them a great overthrow, and abated their courage, and took their spoils.'' (1 Maccabees 5:3)

and still more so when all the Edomites or the Idumaeans were subdued by Hyrcanus, and they became one people with the Jews, and conformed to their religious rites; which is not only related by Josephus ^F14, but by Strabo ^F15, an Heathen historian, who says, that they joined themselves to the Jews, and embraced their laws: but in a spiritual sense this has had a greater accomplishment in the calling of the Gentiles, and introducing them into the church of God; see ( Amos 9:12 ) compared with ( Acts 15:14-17 ) .

Seir also shall be a possession for his enemies;
which was a mount in the land of Edom where Esau formerly dwelt, and so signifies the same as before: and also that the most strong and fortified places of the land should fall into the hands of their enemies; (See Gill on Obadiah 1:17) (See Gill on Obadiah 1:18) (See Gill on Obadiah 1:19)

Israel shall do valiantly;
in fighting with and conquering the Edomites, or shall get much wealth and riches by the spoil of them, see ( Psalms 60:9 Psalms 60:12 ) . This, and the following verse, are in some ancient writings of the Jews ^F16 interpreted of the times of the Messiah.