Galatians 4:24 WEB

²²  For it is written that Abraham had two sons, one by the handmaid, and one by the free woman.

²³  However, the son by the handmaid was born according to the flesh, but the son by the free woman was born through promise.

²⁴  These things contain an allegory, for these are two covenants. One is from Mount Sinai, bearing children to bondage, which is Hagar.

²⁵  For this Hagar is Mount Sinai in Arabia, and answers to the Jerusalem that exists now, for she is in bondage with her children.

²⁶  But the Jerusalem that is above is free, which is the mother of us all.