Contradiction with Genesis 21:12
This verse indicates that Isaac, not Ishmael, is the chosen son through whom Abraham’s descendants will be named, contradicting Abraham's specific request for Ishmael in Genesis 17:18.
Genesis 21:12: And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.