Galatians 4:21-24

Hagar and Sarah 21Tell me, you who want to be under the law, are you not aware of what the law says? 22For it is written that Abraham had two sons, one by the slave woman and the other by the free woman.

23His son by the slave woman was born according to the flesh, but his son by the free woman was born as the result of a divine promise. 24These things are being taken figuratively: The women represent two covenants. One covenant is from Mount Sinai and bears children who are to be slaves: This is Hagar.