What does the Bible say about the story of Sarah and Hagar?

The story of Sarah and Hagar, found in Genesis 16 and interpreted in Galatians 4, serves as an allegory for the two covenants: the covenant of grace and the covenant of the law. Hagar represents the covenant from Mount Sinai, which leads to bondage through the law, while Sarah represents the covenant of grace, which promises freedom and acceptance by God. This distinction emphasizes that salvation is not achieved by human efforts or adherence to the law, but through the gracious promise of God, fulfilled in Christ.