Romans 3:28 (and James 2:24)
“We therefore conclude that a man is justified by faith apart from the works of the law. (Romans 3:28 WEB) You see that by works a man is justified, and not only by faith. (James 2:24 WEB)”
Paul, writing to the church in Rome (mid-1st century CE), is systematically explaining how both Jews and Gentiles are saved, arguing that righteousness comes from God through faith in Jesus Christ, not through adherence to the Jewish law. James, likely writing to Jewish Christians scattered abroad (also mid-1st century CE), addresses practical Christian living and warns against a passive or intellectual 'faith' that doesn't produce tangible actions.
What does genuine belief look like in action, and how do we discern if our actions truly stem from that belief?