Galatians 4:22-25

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—

25for this Hagar is Mount Sinai in Arabia, and corresponds to Jerusalem which now is, and is in bondage with her children—