A possession; which was also foretold Genesis 25:23, and in part fulfilled, 2 Samuel 8:14 1 Chronicles 18:13, but more fully by Christ, Amos 9:12 Obadiah 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, Genesis 36:8, which may be here mentioned as the strongest part of Edom, to show that not only the rest of Edom, which is more accessible, but even the rocks and best munitions of it, shall be taken. His enemies, the Israelites. Do valiantly, or, gain power, or riches, or victory, all which are comprehended in this phrase.
Related Commentaries of Numbers 24:18
Numbers 24:18
18 And Edom shall be a possession, Seir also shall be a possession for his enemies; and Israel shall do valiantly.