Galatians 4:22-24

New International Version

²² For it is written that Abraham had two sons, one by the slave woman^(A) and the other by the free woman.^{(B) 23} His son by the slave woman was born according to the flesh,^(C) but his son by the free woman was born as the result of a divine promise.^(D)

²⁴ These 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.