Romans 4:6; Romans 4:11

6 David says the same thing when he speaks of the blessedness of the one to whom God credits righteousness apart from works:

11 And he received circumcision as a sign, a seal of the righteousness that he had by faith while he was still uncircumcised. So then, he is the father of all who believe but have not been circumcised, in order that righteousness might be credited to them.