Genesis 21:9-13

9But Sarah saw the son mocking — the one Hagar the Egyptian had borne to Abraham.

10So she said to Abraham, “Drive out this slave with her son, for the son of this slave will not be a coheir with my son Isaac!”

11This was very distressing to Abraham because of his son.

12But God said to Abraham, “Do not be distressed about the boy and about your slave. Whatever Sarah says to you, listen to her, because your offspring will be traced through Isaac,

13and I will also make a nation of the slave’s son because he is your offspring.”