Galatians 4:22-24

22For it is written that Abraham had two sons: the one by a bondwoman, the other by a freewoman.

23But he who was of the bondwoman was born according to the flesh, and he of the freewoman through promise,

24which things are symbolic. For these are the two covenants: the one from Mount Sinai which gives birth to bondage, which is Hagar—