Genesis 21:10-12

AKJV(i) 10 Why she said to Abraham, Cast out this female slave and her son: for the son of this female slave shall not be heir with my son, even with Isaac. 11 And the thing was very grievous in Abraham's sight because of his son. 12 And God said to Abraham, Let it not be grievous in your sight because of the lad, and because of your female slave; in all that Sarah has said to you, listen to her voice; for in Isaac shall your seed be called.