Now we, my brothers, are like Isaac, for we are children born “by promise”. But just as in those far-off days the natural son persecuted the “spiritual” son, so it is today. Yet what is the scriptural instruction? ‘Cast out the bondwoman and her son, for the son of the bondwoman shall not be heir with the son of the freewoman.’
Tell me now, you who have become so enamored with the law: Have you paid close attention to that law? Abraham, remember, had two sons: one by the slave woman and one by the free woman. The son of the slave woman was born by human connivance; the son of the free woman was born by God’s promise. This illustrates the very thing we are dealing with now. The two births represent two ways of being in relationship with God. One is from Mount Sinai in Arabia. It corresponds with what is now going on in Jerusalem—a slave life, producing slaves as offspring. This is the way of Hagar. In contrast to that, there is an invisible Jerusalem, a free Jerusalem, and she is our mother—this is the way of Sarah. Remember what Isaiah wrote: Rejoice, barren woman who bears no children, shout and cry out, woman who has no birth pangs, Because the children of the barren woman now surpass the children of the chosen woman. Isn’t it clear, friends, that you, like Isaac, are children of promise? In the days of Hagar and Sarah, the child who came from faithless connivance (Ishmael) harassed the child who came—empowered by the Spirit—from the faithful promise (Isaac). Isn’t it clear that the harassment you are now experiencing from the Jerusalem heretics follows that old pattern? There is a Scripture that tells us what to do: “Expel the slave mother with her son, for the slave son will not inherit with the free son.” Isn’t that conclusive? We are not children of the slave woman, but of the free woman.
But what does Scripture say? “Get rid of the slave woman. Get rid of her son. The slave woman’s son will never have a share of the family’s property. He’ll never share it with the free woman’s son.” (Genesis 21:10)
But what do the Holy Writings say? They say, “Put the woman servant who is owned by someone and her son out of your home. The son of that woman servant will never get any of the riches of the family. It will all be given to the son of the free woman.”
But what does the holy writings say? They says, `Put away the slave woman and her son. The son of the slave woman will have nothing when the father dies. The son of the free woman will have everything.'
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