Galatians 4:22-28

22For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.

23But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.

24Which things are an allegory: for these are the two covenants; the one from the mount Sinai, which gendereth to bondage, which is Hagar.

25For this Hagar is mount Sinai in Arabia, and answereth to Jerusalem which now is, and is in bondage with her children.

26But Jerusalem which is above is free, which is the mother of us all.

27For it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not: for the desolate hath many more children than she which hath an husband.

28Now we, brethren, as Isaac was, are the children of promise.