Galatians 4:28-31

28Now you,1 brothers, like Isaac, are children of promise. 29At that time, however, the son born by the flesh persecuted the son born by the Spirit. It is the same now.

30But 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.”2 31Therefore, brothers, we are not children of the slave woman, but of the free woman.