Genesis 21:9-11

Young's Literal Translation

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;