21Tell me, ye that desire
to be under the law, do ye not hear the law?  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 Agar.  25For this Agar 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.
 29But as then he that was born after the flesh
persecuted him that was born after the Spirit, even so it is now.  30Nevertheless what saith the scripture? Cast out the bondwoman and her
son: for the son of the bondwoman shall not be heir with the son of the freewoman.  31So then, brethren, we are not children of the
bondwoman, but of the free. (Galatians
4:21-31, King James
Version)