Romans 11:1 - 36
ESV - 1 I ask, then, has God rejected his people? By no means! For I myself am an Israelite, a descendant of Abraham, a member of the tribe of Benjamin. 2 God has not rejected his people whom he foreknew. Do you not know what the Scripture says of Elijah, how he appeals to God against Israel?
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
When the Jews are brought back from all parts of the world (Isaiah 66) by Gentiles to their millennial kingdom. The fullness of the Gentiles is not the last Gentile saved. In this dispensation of grace, there is neither Jew nor Gentile. Use the KJV only and learn to rightly divide prophecy from mystery 2Tim2:15