Genesis 21:10 in the King James Version
Wherefore 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.
Context
9 Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking.
10 Therefore she said to Abraham, “Cast out this servant and her son! For the son of this servant will not be heir with my son, Isaac.”
11 The thing was very grievous in Abraham’s sight on account of his son.