That's the dispensational view Rose from gotquestions - the question not addressed in the above is how can all Israel be saved all the way back to the 1st century by Jesus returning in the future? Do the unbelieing Jews since the first century get a "get out of "hell" card" while the rest of us have to come in by faith?
I just posted this in the other thread, which is somewhat relevant here:
Rom 11:7 What then? What Israel is seeking, it has not obtained, but those who were chosen obtained it, and the rest were hardened.
Rom 11:17 But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and became partaker with them of the rich root of the olive tree,
The traditional view of the above it that the 1st century unbelieving Jews/Judah are being spoken off.
It is my opinion that he is speaking of the dispersed 10 tribes of Israel, I say that because the were swept away into the Gentile nations for idolatry and killing the prophets etc:
Rom 11:3 Lord, THEY HAVE KILLED YOUR PROPHETS, THEY HAVE TORN DOWN YOUR ALTARS, AND I ALONE AM LEFT, AND THEY ARE SEEKING MY LIFE.”
Rom 11:4 But what is the divine response to him? “I HAVE KEPT for Myself SEVEN THOUSAND MEN WHO HAVE NOT BOWED THE KNEE TO BAAL.”
There is no doubt that many 1st century "Jews" rejected Christ and were cut off in the war of 66-70 AD - "the wrath to come" of John the Baptist.
Romans was written around mid 50 AD, so the gathering of the diaspora of the ten tribes was still in its early days.
When Peter wrote his first letter around 64 AD we see he is addressing the diaspora of the ten tribes as a royal nation, a holy priesthood:
1 Pet 1:1 Peter, an apostle of Jesus Christ, To those who reside as aliens (Greek - parepidemos), scattered (Greek - diaspora) throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia, who are chosen.
parepidemos - an alien alongside, i.e. a resident foreigner.
diaspora - dispersion, i.e. (specially and concretely) the (converted) Israelite resident in Gentile countries
Peter is not addressing Gentiles as is claimed by some commentaries, he is addressing the ten scattered tribes as can be seen by his use of the Greek "parepidemos", a resident foreigner, which means they were not native to lands they were scattered in.
1 peter 2:9 But you are A CHOSEN RACE, A royal PRIESTHOOD, A HOLY NATION, A PEOPLE FOR God’s OWN POSSESSION, so that you may proclaim the excellencies of Him who has called you out of darkness into His marvelous light;
James also addresses all of the 12 tribes who were being gathered in the 1st century and calling them first fruits:
James 1:1 James, a bond-servant of God and of the Lord Jesus Christ, To the twelve tribes who are dispersed abroad: Greetings.
James 1:18 In the exercise of His will He brought us forth by the word of truth, so that we would be a kind of first fruits among His creatures.
The conclusion is that all the tribes were being gathered in Christ as promised by the prophets, there is no further gathering of the tribes at some later date 1970 years and counting into the future as posited by dispensationalism and therefore all Israel was saved prior to the war of 66-70 AD.