But God said to Abraham, “Don't be worried about the boy and your slave Hagar. Do whatever Sarah tells you, because it is through Isaac that you will have the descendants I have promised.
But God said, “No. Your wife Sarah will bear you a son and you will name him Isaac. I will keep my covenant with him and with his descendants forever. It is an everlasting covenant.
From the beginning I predicted the outcome; long ago I foretold what would happen. I said that my plans would never fail, that I would do everything I intended to do.
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.”