Romans 11:5-6, 25-27

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].

I do not want you, believers, to be unaware of this mystery [God’s previously hidden plan]—so that you will not be wise in your own opinion—that a partial hardening has [temporarily] happened to Israel [to last] until the full number of the Gentiles has come in; and so [at that time] all Israel [that is, all Jews who have a personal faith in Jesus as Messiah] will be saved; just as it is written [in Scripture], “THE DELIVERER (Messiah) WILL COME FROM ZION, HE WILL REMOVE UNGODLINESS FROM JACOB.” [Is 59:20, 21] “THIS IS MY COVENANT WITH THEM, WHEN I TAKE AWAY THEIR SINS.” [Is 27:9; Jer 31:33]