What does the Bible say about the bond-woman and free-woman?

In Galatians 4, the apostle Paul highlights an allegory between two women, Hagar and Sarah, representing two covenants: the bond-woman symbolizes the covenant of works, which leads to slavery and is characterized by self-righteous efforts to achieve justification. The free-woman, on the other hand, represents the covenant of grace, which offers salvation through faith in Jesus Christ, apart from the law. This allegorical interpretation emphasizes the fundamental distinction between trying to earn salvation through deeds and receiving it as a promise.