23 The son by the slave woman was conceived the normal way, but the son by the free woman was conceived through a promise.
24 These things are an allegory: the women are two covenants. One is from Mount Sinai, which gives birth to slave children; this is Hagar.
25 Hagar is Mount Sinai in Arabia, and she corresponds to the present-day Jerusalem, because the city is in slavery with her children.
26 But the Jerusalem that is above is free, and she is our mother.
27 It’s written: Rejoice, barren woman, you who have not given birth. Break out with a shout, you who have not suffered labor pains; because the woman who has been deserted will have many more children than the woman who has a husband.
28 Brothers and sisters, you are children of the promise like Isaac.
29 But just as it was then, so it is now also: the one who was conceived the normal way harassed the one who was conceived by the Spirit.