What would have happened if Israel repented of national sins and believed Jesus was who He was?

Les explains that God was still dealing with the nation of Israel. If they would repent of their national sins and believe who Jesus was, God would have brought in the tribulation, it could have run its course, Christ could have returned, and Israel could have had the kingdom. Then Peter and the eleven knew that when that was fulfilled, they could take the gospel of their God of Abraham to the Gentile world—but not until. The twelve did not leave Jerusalem because it was to Jerusalem, to the Mount of Olives, that their king was going to imminently return. This fits Zechariah 8, where many people and strong nations come to seek the Lord of hosts in Jerusalem.