In Galatians 1-3, Paul addresses the churches in Galatia, confronting the perversion of the Gospel by some who advocate adherence to the Mosaic Law for salvation. Paul, asserting his apostolic authority, declares that he received the Gospel through divine revelation. He emphasizes that justification is attained solely through faith in Christ, not by works of the law. Paul recalls his confrontational encounter with Peter over his hypocritical behavior, elucidating that both Jews and Gentiles are justified by faith. He illustrates the purpose of the Law as a guardian leading to Christ, highlighting the believers' status as Abraham’s descendants and heirs to the promise through faith. The overarching theme is the supremacy of faith over the law for attaining righteousness in Christ.