Romans 11:16, 28

If the first piece of bread is offered to God, then the whole loaf is made holy. If the roots of a tree are holy, then the tree’s branches are holy too.

The Jews refuse to accept the Good News, so they are God’s enemies. This has happened to help you who are not Jews. But the Jews are still God’s chosen people, and he loves them very much because of the promises he made to their ancestors.