Thematic Bible: Concubines might be dismissed

And Sarah saw the son of Hagar the Egyptian, whom she had borne unto Abraham, mocking. Therefore she said unto Abraham, Cast out this bondwoman and her son: for the son of this bondwoman shall not be heir with my son, even with Isaac. And the thing was very displeasing in Abraham's sight because of his son. read more.
And God said unto Abraham, Let it not be displeasing in your sight because of the lad, and because of your bondwoman; in all that Sarah has said unto you, listen unto her voice; for in Isaac shall your descendants be called. And also of the son of the bondwoman will I make a nation, because he is your descendant. And Abraham rose up early in the morning, and took bread, and a skin of water, and gave it unto Hagar, putting it on her shoulder, and the child, and sent her away: and she departed, and wandered in the wilderness of Beersheba.