Thematic Bible: Sends hagar and ishmael away

So she said to Abraham, Send away that woman and her son: for the son of that woman is not to have a part in the heritage with my son Isaac. And this was a great grief to Abraham because of his son. But God said, Let it not be a grief to you because of the boy and Hagar his mother; give ear to whatever Sarah says to you, because it is from Isaac that your seed will take its name. read more.
And I will make a nation of the son of your servant-woman, because he is your seed. And early in the morning Abraham got up, and gave Hagar some bread and a water-skin, and put the boy on her back, and sent her away: and she went, wandering in the waste land of Beer-sheba.

Because it is in the Writings, that Abraham had two sons, one by the servant-woman, and one by the free woman. Now the son by the servant-woman has his birth after the flesh; but the son by the free woman has his birth through the undertaking of God. Which things have a secret sense; because these women are the two agreements; one from the mountain of Sinai, giving birth to servants, which is Hagar. read more.
Now this Hagar is the mountain Sinai in Arabia, and is the image of the Jerusalem which now is: which is a servant with her children. But the Jerusalem on high is free, which is our mother. For it is in the Writings, You who have never given birth, be glad; give cries of joy, you who have had no birth-pains; for the children of her who has been given up by her husband are more than those of the woman who has a husband. Now we, brothers, as Isaac was, are the children of the undertaking of God. But as in those days he who had birth after the flesh was cruel to him who had birth after the Spirit, even so it is now. What then do the Writings say? Send away the servant-woman and her son; for the son of the servant-woman will not have a part in the heritage with the son of the free woman.