that is, Hagar (and Hagar means Mount Sinai, in Arabia) and corresponds to the present Jerusalem, for Jerusalem is in slavery with her children.

Which things are figurative; for these persons are emblems of the two covenants, the one from mount Sinai, bringing forth children unto bondage, which is Hagar: for this name Hagar,

For it is written in the law about Abraham's two sons [Gen. 16]; one [was] by his slave woman [Hagar] and the other by the free woman, [his wife, Sarah].

What does the Scripture say about this matter? [It says, Gen. 21:10-12], "Get rid of the slave woman [Hagar], with her son [Ishmael]; for the son of the slave woman [Ishmael] will not inherit [what God promised to Abraham and his descendants], along with the son of the free woman [i.e., Isaac]."

Therefore, brothers, we [Christians] are not the [spiritual] children of the slave woman [Hagar] but of the free woman [Sarah].