For it is written, that Abraham had two sons, the one by a bondmaid, the other by a free woman. But he who was of the bondwoman was born after the flesh; but he of the free woman was by promise.
Which things are an allegory: for these are the two covenants; the one from mount Sinai, which brings forth to bondage, which is Hagar. For this Hagar is mount Sinai in Arabia, and answers to Jerusalem which now is, and is in bondage with her children. But Jerusalem which is above is free, which is the mother of us all.
Follow along with the Life & Teachings of Paul bonus study questions.