What does the Bible say about the allegory of two covenants?

In Galatians 4, the Apostle Paul uses the example of Sarah and Hagar to illustrate two covenants: the covenant of grace represented by Sarah and her son Isaac, and the covenant of works represented by Hagar and her son Ishmael. The narrative emphasizes that believers are children of promise, like Isaac, and are free from the law and its bondage. This teaching underscores the importance of understanding our inheritance in Christ, which comes solely by grace, and the futility of relying on works for righteousness.