NET
18 Edom will be a possession, Seir, his enemy, will also be a possession; but Israel will act valiantly.
Darby
18 And Edom shall be a possession, and Seir a possession, they, his enemies; but Israel will do valiantly.
KJV
18 And Edom shall be a possession, Seir also shall be a possession for his enemies; and Israel shall do valiantly.