What is the makeup of the Old Testament according to this teaching?
The Old Testament's makeup is Israel under the Law, with the priesthood, tabernacle, and temple worship. It spans from Abraham and the Abrahamic covenant, through Moses and the Law around 1,500 B.C., to the Babylonian captivity, Ezra's temple rebuilding, and the remnant's return.
Les explains that the Old Testament's makeup centers on Israel under the Law. After God called Abram out of Ur and made the Abrahamic covenant, promising a nation through whom redemption would come, Israel became a nation 500 years later, came out of Egypt under Moses, and received the Law around 1,500 B.C. From Abraham until Christ, God dealt almost exclusively with Israel, with a few Gentile exceptions. Once the Law came, Israel had the tabernacle and temple, so the Old Testament is Israel under the Law with the priesthood and temple worship. This was interspersed with the Babylonian captivity from 606 B.C. for 70 years; after Nebuchadnezzar destroyed Jerusalem, God commanded Cyrus of Persia to rebuild the temple under Ezra, and a remnant returned to set the stage for Israel at Christ's coming.