And David speaks likewise of the blessedness of the man to whom God credits righteousness apart from works:
6. As David also defines, etc. We hence see the sheer sophistry of those who limit the works of the law to ceremonies; for he now simply calls those works, without anything added, which he had before called the works of the law.
Here the apostle proves that Abraham was justified not by works, but by faith. Those that of all men contended most vigorously for a share in righteousness by the privileges they enjoyed, and the works they performed, were the Jews, and therefore he appeals to the case of Abraham their father, and puts his own name to the relation, being a Hebrew of the Hebrews: Abraham our father.
Commenting on Romans 4:1-8
Even as David also describeth the blessedness of the man,.... the apostle having instanced in Abraham, the father of the Jewish nation, cites some passages from David, king of Israel, a person of great note and esteem among the Jews, in favour of the doctrine he is establishing; who in a very proper and lively manner describes the happiness of such persons: unto whom God imputeth righteousness without works.