Where has Israel been while Gentiles feed on the root of Abraham?
Israel has been out in a dispersion for the last 1900 and some years, while the Gentile world rested and fed on the fatness of the root of Abraham. Gentiles were brought into a place of privilege and opportunity for salvation based on the promises made to Abraham.
Les explains that when God set Israel aside, He brought the whole Gentile world into a place of privilege—not that all are saved, but they now have an opportunity for salvation based on the promises made to Abraham. For the last 1900 and some years, Gentiles have been resting and feeding on the fatness of the root of Abraham while Israel has been out there in a dispersion. But a day is coming, perhaps close, when God will shut the door on the Gentile world, break them off from their grafted position, and graft Israel back in, as Paul says in Romans chapter 11. Then Gentiles will find themselves again where they were before, without a Messiah and outside the covenant promises.