Adam Clarke on Romans 11:28

As concerning the Gospel - The unbelieving Jews, with regard to the Gospel which they have rejected, are at present enemies to God, and aliens from his kingdom, under his Son Jesus Christ, on account of that extensive grace which has overturned their peculiarity, by admitting the Gentiles into his Church and family: but with regard to the original purpose of election, whereby they were chosen and separated from all the people of the earth to be the peculiar people of God, they are beloved for the fathers' sake; he has still favor in store for them on account of their forefathers the patriarchs.