Galatians 4:21-31 - Hagar And Sarah Represent Two Covenants
21 But tell me, you that are so willing to be under the law, why don't you consider the law? 22 for it is there written, Abraham had two sons, the one by a bond-maid, the other by a free-woman. 23 he, who was of the bond-woman, was born according to the ordinary course of nature; but he, who was of the free-woman, was born by virtue of the promise. 24 these things have an allegorical meaning: the two women signify the two covenants, the one from mount Sinai, which is represented by Agar, whose children were born in a state of servitude. 25 this Agar answers to the Jerusalem now in being, for she is in servitude with her children: 26 but the heavenly Jerusalem is represented by the free-woman, who is the mother of us all. 27 for it is written, "rejoice thou barren, that bearest not; break out into loud acclamations, thou that hast not the travels of childbirth, for more are the children of the desolate, than of her that hath an husband."
28 Now we, my brethren, as Isaac was, are the children of the promise. 29 but as then, he that was born in the ordinary course of nature, persecuted him, who was born by an extraordinary power; even so it is now. 30 but what saith the scripture? "cast out the bond-woman and her son; for the son of the bond-woman shall not share the inheritance with the son of the free-woman."
31 so then, my brethren, we are not children of the bond-woman, but of the free-woman, by virtue of that freedom which Christ has procur'd for us.