How will God be Israel's government in the Messianic future?
God will come and personally be Israel's government in the Messianic future, fulfilling the Abrahamic covenant promise. Their government will be epitomized in the King, the Messiah. This was sworn to Abraham: a nation, a land, and God Himself as their government.
Les explains that the Abrahamic covenant promised Abraham a nation, a geographical land (the promised land), and that at a future day God would come and be their government. This government is epitomized in the King, the Messiah, as referenced in Isaiah chapter 7 or 9. Les emphasizes the Jewish context: Israel's enemies surround them, but the covenant assures that God Himself will rule over them in the Messianic future.