And I will bless her and give you a son from her! Yes, I will bless her richly, and she will become the mother of many nations. Kings of nations will be among her descendants.”
Then God blessed them and said, “Be fruitful and multiply. Fill the earth and govern it. Reign over the fish in the sea, the birds in the sky, and all the animals that scurry along the ground.”
But God replied, “No—Sarah, your wife, will give birth to a son for you. You will name him Isaac, and I will confirm my covenant with him and his descendants as an everlasting covenant.
They gave her this blessing as she parted: “Our sister, may you become the mother of many millions! May your descendants be strong and conquer the cities of their enemies.”
And the Lord told her, “The sons in your womb will become two nations. From the very beginning, the two nations will be rivals. One nation will be stronger than the other; and your older son will serve your younger son.”
Then God said, “I am El-Shaddai—‘God Almighty.’ Be fruitful and multiply. You will become a great nation, even many nations. Kings will be among your descendants!
Kings and queens will serve you and care for all your needs. They will bow to the earth before you and lick the dust from your feet. Then you will know that I am the Lord. Those who trust in me will never be put to shame.”
The son of the slave wife was born in a human attempt to bring about the fulfillment of God’s promise. But the son of the freeborn wife was born as God’s own fulfillment of his promise.
For instance, Sarah obeyed her husband, Abraham, and called him her master. You are her daughters when you do what is right without fear of what your husbands might do.