Again, Romans 2, right at the beginning of his letter, "Indeed you are called a Jew." His letter is all about Jews and Gentiles, about the Mosaic Law, about circumcision. That's the focus of the letter of Romans. "Indeed you are called a Jew and rest on the Law." He's talking about the Law of Moses. "You're a Jew," he says, "and make your boast in God." And the background to Romans is set out in Acts 15. So it's good in our Bibles you have Acts before Romans.