Romans 11:17-21

But some of these branches from Abraham’s tree—some of the people of Israel—have been broken off. And you Gentiles, who were branches from a wild olive tree, have been grafted in. So now you also receive the blessing God has promised Abraham and his children, sharing in the rich nourishment from the root of God’s special olive tree. But you must not brag about being grafted in to replace the branches that were broken off. You are just a branch, not the root. “Well,” you may say, “those branches were broken off to make room for me.” 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. For if God did not spare the original branches, he won’t spare you either.