Genesis 21:10-12

Revised Standard Version

¹⁰ So she said to Abraham, “Cast out this slave woman with her son; for the son of this slave woman shall not be heir with my son Isaac.” ¹¹ And the thing was very displeasing to Abraham on account of his son. ¹² But God said to Abraham, “Be not displeased because of the lad and because of your slave woman; whatever Sarah says to you, do as she tells you, for through Isaac shall your descendants be named.