Tell me, you who want to be under the law, are you not aware of what the law says?
References for Galatians 4:21
For it is written that Abraham had two sons, one by the slave woman and the other by the free woman.
References for Galatians 4:22
His 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.
References for Galatians 4:23
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.