BSB(i)
26 But the Jerusalem above is free, and she is our mother.
27 For it is written: “Rejoice, O barren woman, who bears no children; break forth and cry aloud, you who have never travailed; because more are the children of the desolate woman than of her who has a husband.”
28 Now you, brothers, like Isaac, are children of promise.
29 At that time, however, the son born by the flesh persecuted the son born by the Spirit. It is the same now.
30 But what does the Scripture say? “Expel the slave woman and her son, for the slave woman’s son will never share in the inheritance with the free woman’s son.”
31 Therefore, brothers, we are not children of the slave woman, but of the free woman.