For this Hagar is Mount Sinai in Arabia, and represents Jerusalem that exists now, for she is in slavery with her children.

For it is written, "Rejoice, you barren who do not bear. Break forth and shout, you that do not travail. For more are the children of the desolate than of her who has a husband."

However what does the Scripture say? "Throw out the handmaid and her son, for the son of the handmaid will not inherit with the son of the free woman."