Romans 11:1-2, 20

I ask, then, has God rejected his own people, the nation of Israel? Of course not! I myself am an Israelite, a descendant of Abraham and a member of the tribe of Benjamin. No, God has not rejected his own people, whom he chose from the very beginning. Do you realize what the Scriptures say about this? Elijah the prophet complained to God about the people of Israel and said

Yes, but remember—those branches were broken off because they didn’t believe in Christ, and you are there because you do believe. So don’t think highly of yourself, but fear what could happen.