“And so all Israel will be saved.” The context indicates that Paul must be speaking of the Jewish people. He does not mean every Jew that ever lived, but the nation of Israel. Now why do I say that ‘Israel’ in this phrase refers to the Jews? All through his discussion Paul is talking about Israel in part: part of Israel has been blinded, part of Israel has been cut away, part of Israel has been stubborn, part of Israel has been excluded from the kingdom of God and its blessings. The Jews as a people are presently under judgment. But as there was a national judgment, so there will be a national restoration. Their rejection, even though it was a national rejection, did not include the rejection of every individual. So the restoration doesn’t necessarily mean that every individual Jew will be saved, but the nation as a nation will be restored to God. - RC Sproul