Do the Old Testament verses about Israel and the Gentiles contain any hint of the Church Age?
No. The Old Testament verses describing Israel and the Gentiles contain not one hint of the Church Age. They speak only of God dealing with Israel and His intention to use the nation to bring salvation to the Gentiles, a prospect Israel dropped through unbelief.
Les explains that all those Old Testament verses read earlier still contain no hint of the Church Age. They concern God dealing with Israel, and at one point God wanted to funnel Israel back into the pagan, polluted stream of humanity and thereby purify it. But Israel in unbelief left the arrow down into the Gentile stream, still present but in the opposite role God intended. The cross and Christ's three-year earthly ministry to Israel fit here; He never went outside Israel—not to Babylon, Syria, Greece, or Egypt—spending all three years only with the nation of Israel.