Genesis 21:12

9 And Sarah saw the son of Hagar the Egyptian playing with Isaac.

10 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.

11 And this was a great grief to Abraham because of his son.

12 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.

13 And I will make a nation of the son of your servant-woman, because he is your seed.

14 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.

15 And when all the water in the skin was used up, she put the child down under a tree.