Genesis 21:9-13

Now Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking Isaac.

Therefore she said to Abraham, “Drive out this slave woman and her son, for the son of this slave woman shall not be an heir with my son Isaac!”

The matter distressed Abraham greatly because of his son Ishmael.

But God said to Abraham, “Do not be distressed because of the boy and your slave woman; whatever Sarah tells you, listen to her, for through Isaac your descendants shall be named.

And of the son of the slave woman I will make a nation also, because he is your descendant.”