[…] Remember, the church, the body of Christ, in continuity with the righteous remnant of the OT, is NOT a NEW, but a ‘newly revealed’ entity (important distinction). Such a revealed entity does not end with the rapture, as held by some. Rather, at the end of Jacob’s trouble, the remnant of Israel that are left are transformed by the same revelation that arrested Paul on the Damascus road. It is this life giving revelation that makes the church the church (Mt 16:17-18), regardless of dispensation, whether now, or in a future millennium. The saved of Israel, together with all that will be gathered to Christ throughout the millennium, will be at that time the born again body of Christ on earth awaiting glorification at the second resurrection, but under a unique stewardship appropriately suited to that dispensation of divine purpose.
So then, who is ‘all Israel’? In Paul’s usage, ‘all Israel’ does not mean all that will ultimately be saved, i.e., the final coming in of all the elect. That is an attractive interpretation, but it does not satisfy the demands of the context. Manifestly, Paul has in mind the national regeneration of Israel at the end of the age.
Nor does “all Israel” mean every Jew, because two thirds will have been cut off out of the Land, and also many will fall in the wilderness of the nations during the desolations of Jacob’s trouble. Rather, the term ‘all Israel’ has in view a phenomenal uniformity of Jewish salvation that will obtain and endure throughout the millennium, extending into final perfection at the second resurrection. […]