Galatians 4:22-28

22For it is written, that Abraham had two sons, one by the handmaid, and one by the freewoman.

23Howbeit the son by the handmaid is born after the flesh; but the son by the freewoman is born through promise.

24Which things contain an allegory: for these women are two covenants; one from mount Sinai, bearing children unto bondage, which is Hagar.

25Now this Hagar is mount Sinai in Arabia, and answereth to the Jerusalem that now is: for she is in bondage with her children.

26But the Jerusalem that is above is free, which is our mother.

27For it is written, Rejoice, thou barren that bearest not; Break forth and cry, thou that travailest not: For more are the children of the desolate than of her which hath the husband.

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