Romans 11:5-7, 23-24, 28-32

So too then, at the present time there has come to be a remnant [a small believing minority] according to God’s gracious choice. But if it is by grace [God’s unmerited favor], it is no longer on the basis of works, otherwise grace is no longer grace [it would not be a gift but a reward for works]. What then? Israel failed to obtain what it was seeking [that is, God’s favor by obedience to the Law], but the elect [those chosen few] obtained it, while the rest of them became hardened and callously indifferent

And even they [the unbelieving Jews], if they do not continue in their unbelief, will be grafted in; for God has the power to graft them in again. For if you were cut off from what is by nature a wild olive tree, and against nature were grafted into a cultivated olive tree, how much easier will it be to graft these who are the natural branches back into [the original parent stock of] their own olive tree?

From the standpoint of the gospel, the Jews [at present] are enemies [of God] for your sake [which is for your benefit], but from the standpoint of God’s choice [of the Jews as His people], they are still loved by Him for the sake of the fathers. For the gifts and the calling of God are irrevocable [for He does not withdraw what He has given, nor does He change His mind about those to whom He gives His grace or to whom He sends His call]. Just as you once were disobedient and failed to listen to God, but have now obtained mercy because of their disobedience, so they too have now become disobedient so that they too may one day receive mercy because of the mercy shown to you. For God has imprisoned all in disobedience so that He may show mercy to all [Jew and Gentile alike].