What does Les say is the whole scope of the Old Testament?
The whole scope of the Old Testament was bringing the nation of Israel onto the scene, giving them the Abrahamic covenant, making them a nation of people, placing them in a geographical area of land, and one day having God Himself come in the person of the Messiah to be their King.
Les explains that the whole scope of the Old Testament centers on bringing the nation of Israel on the scene and giving them the Abrahamic covenant. God would make them a nation of people, put them in a geographical area of land, and one day He Himself would come in the person of the Messiah to be their King. Les also connects this to Israel's role as the vehicle to bring the knowledge of their God to all the other nations, quoting Rabbi Shlomo Riskin's statement that Abraham was promised a nation from his own loins would survive and declare the name of the one God to the world. He further notes that much of the Old Testament is written in the future tense, as seen in the Abrahamic covenant's 'I will' promises.