Because Abraham was promised that he would inherit the land “from the river of Egypt to the great river, the river Euphrates” (Gen. 15:18), so then his Seed will rule “from the River to the ends of the earth” (Ps. 72:8; Zech. 9:10). Such a geographical demarcation between the Euphrates and the ends of the earth confirms the geopolitical demarcation of the kingdom of God in the age to come. Hence the land of Canaan itself is a prophetic oracle, of sorts, inherently prophesying the age to come, and the Jews were and are stewards of that oracle (cf. Matt. 21:33; Rom. 3:2). - John P. Harrigan, The Gospel of Christ Crucified