Adam Clarke on Romans 11:30

For as ye in times past - The apostle pursues his argument in favor of the restoration of the Jews. As ye, Gentiles, in times past - for many ages back.

Have not believed - Were in a state of alienation from God, yet not so as to be totally and for ever excluded,

Have now obtained mercy - For ye are now taken into the kingdom of the Messiah; through their unbelief - by that method which, in destroying the Jewish peculiarity, and fulfilling the Abrahamic covenant, has occasioned the unbelief and obstinate opposition of the Jews.