Genesis 21:9-15

9But Sarah noticed the son of Hagar the Egyptian – the son whom Hagar had borne to Abraham – mocking.

10So she said to Abraham, “Banish that slave woman and her son, for the son of that slave woman will not be an heir along with my son Isaac!”

11Sarah’s demand displeased Abraham greatly because Ishmael was his son.

12But God said to Abraham, “Do not be upset about the boy or your slave wife. Do all that Sarah is telling you because through Isaac your descendants will be counted.

13But I will also make the son of the slave wife into a great nation, for he is your descendant too.”

14Early in the morning Abraham took some food and a skin of water and gave them to Hagar. He put them on her shoulders, gave her the child, and sent her away. So she went wandering aimlessly through the wilderness of Beer Sheba.

15When the water in the skin was gone, she shoved the child under one of the shrubs.