Most Christians have no idea how important these verses are to understanding the entire Bible...
Galatians 4:22-26
"For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman. But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise. Which things are an allegory: for these are the two covenants; the one from the mount Sinai, which gendereth to bondage, which is Agar. For this Agar is mount Sinai in Arabia, and answereth 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."
Hagar = Old Testament/Earthly Jerusalem
Sarah = New Testament/Heavenly Jerusalem
The two cities are being related to two *Women*. Why? Look at the verses carefully.
Hagar gives birth to Children of Bondage
Sarah gives birth to Children of Freedom
Another way of putting it...
Earthly Jerusalem gives birth to Children of Bondage
Heavenly Jerusalem gives birth to Children of Freedom
Long story short,
the two cities represent two Wombs...
The Earthly Womb gives birth to a body of corruption, i.e., the Human Race as it is.
The Heavenly Womb gives birth to a body of incorruption, i.e., the Glorified Body
The entire Bible is about Eugenics told in euphemisms. Most people have no idea.