What kind of government was promised to come from Abraham and David's line?

Les explains that David becomes the beginning of a royal family that will lead not only through generations of this existence but all the way into eternity, because out of Abraham and David’s line would come this government. He stresses that this government will not be a democracy but a monarchy, ruled by the King of Kings and Lord of Lords. The ruler will not be a despot or a totalitarianist; He will be benevolent, and His kingdom will be righteous, fair, and glorious. Les says this prospect was laid out in the Abrahamic covenant, and the rest of the Old Testament rests on that covenant. He also notes other covenants: the Law with Moses, the promise that Israel would be brought back to their homeland, and the promise to David of a royal family leading up to the King—that is the government. Les then directs attention to Isaiah chapter 9, verse 6.