Genesis 21:11 YLT

⁹  and Sarah seeth the son of Hagar the Egyptian, whom she hath borne to Abraham, mocking,

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.

¹³  As to the son of the handmaid also, for a nation I set him, because he 'is' thy seed.'