Some of you still want to be under the law. Tell me, do you know what the law says?
The Scriptures say that Abraham had two sons. The mother of one son was a slave woman, and the mother of the other son was a free woman.
Abraham's son from the slave woman was born in the normal human way. But the son from the free woman was born because of the promise God made to Abraham.
This story teaches something else: The two women are like the two agreements between God and his people. One agreement is the law that God made on Mount Sinai, and the people who are under this agreement are like slaves. The mother named Hagar is like that agreement.
She is like Mount Sinai in Arabia and is a picture of the earthly Jewish city of Jerusalem. This city and its people, the Jews, are slaves to the law.
But the heavenly Jerusalem, which is above, is like the free woman. She is our mother.
It is written in the Scriptures: "Be happy, Jerusalem. You are like a woman who never gave birth to children. Start singing and shout for joy. You never felt the pain of giving birth, but you will have more children than the woman who has a husband."
My brothers and sisters, you are God's children because of his promise, as Isaac was then.
The son who was born in the normal way treated the other son badly. It is the same today.
But what does the Scripture say? "Throw out the slave woman and her son. The son of the slave woman should not inherit anything. The son of the free woman should receive it all."
So, my brothers and sisters, we are not children of the slave woman, but of the free woman.