Romans 11:23-29

23And even they, if they do not continue in their unbelief, will be grafted in, for God has the power to graft them in again.

24For if you were cut from what is by nature a wild olive tree, and grafted, contrary to nature, into a cultivated olive tree, how much more will these, the natural branches, be grafted back into their own olive tree.

25Lest you be wise in your own sight, I do not want you to be unaware of this mystery, brothers: a partial hardening has come upon Israel, until the fullness of the Gentiles has come in.

26And in this way all Israel will be saved, as it is written, "The Deliverer will come from Zion, he will banish ungodliness from Jacob";

27"and this will be my covenant with them when I take away their sins."

28As regards the gospel, they are enemies for your sake. But as regards election, they are beloved for the sake of their forefathers.

29For the gifts and the calling of God are irrevocable.