Genesis 21:11-13

Young's Literal Translation

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.'