Verse 18 And Edom shall be a possession - That is, to David: as it is said: "And all they of Edom became David's servants;" 2Sam 8:14. Seir also shall be a possession - That is, unto the king Messiah; as it is said: "And saviours shall come upon Mount Zion to judge the Mount of Esau; and the kingdom shall be the Lord's;" Oba 1:21. See Ainsworth.

A possession - Which was also foretold, Gen 25:23, and in part fulfilled, 2Sam 8:14 1Chr 18:13, but more fully by Christ, Amos 9:12 Ob 1:18, who shall subdue and possess all his enemies; here signified by the name of Edom, as Jacob or Israel, his brother, signifies all his church and people. Seir - A part and, mountain of Edom.

Num 24:18

Seir also shall be a possession for his enemies. Seir (Gen 32:3), or Mount Seir (Gen 36:8), was the old name, still retained as an alternative, of Edom. It is uncertain whether the rendering "for his (i.e; Edom’s) enemies" is correct. The Hebrew is simply àÉéÀáÈéå, which may stand in apposition to Edom and Seir, "his enemies," i.e; the enemies of Israel. So the Septuagint, Ἡσαῦ ὁ ἐχθρὸς αὐτοῦ. Shall do valiantly, or, "shall be prosperous" (cf. Deu 8:17; Rth 4:11).