Genesis 21:10-12

Young's Literal Translation

¹⁰ and she saith to Abraham, `Cast out this handmaid and her son; for the son of this handmaid hath no possession with my son -- with Isaac.'

¹¹ And the thing is very wrong in the eyes of Abraham, for his son's sake;

¹² and God saith unto Abraham, `Let it not be wrong in thine eyes because of the youth, and because of thy handmaid: all that Sarah saith unto thee -- hearken to her voice, for in Isaac is a seed called to thee.