How does Paul address false teachers in Galatians?

In Galatians, Paul warns the churches against false brethren who sought to impose the Mosaic law upon them, diluting the gospel of grace. He asserts that while the law serves to highlight the need for Christ, it should not be used as a means of life post-redemption. In Galatians 2:4-5, he describes these infiltrators as troubling the faith of believers. Instead of embracing legalism, believers are urged to stand firm in the liberty Christ has provided. Paul's corrective is clear: true followers of Christ are defined by faith and not by adherence to the law.