Now this Hagar is Mount Sinai in Arabia and corresponds to the present Jerusalem, for she is in slavery with her children.

For it is written, "Rejoice, O barren woman who does not bear; break forth and shout, you who are not in labor; for the children of the desolate are more numerous than the children of her who has a husband."

But what does the scripture say? "Cast out the slave and her son, for the son of the slave shall not inherit with the son of the free woman."