28 Now, you, my brothers and sisters, are God's children as a result of his promise, just as Isaac was.
29 At that time the son who was born in the usual way persecuted the one who was born because of God's Spirit; and it is the same now.
30 But what does the scripture say? It says, “Send the slave woman and her son away; for the son of the slave woman will not have a part of the father's property along with the son of the free woman.”
31 So then, my brothers and sisters, we are not the children of a slave woman but of a free woman.