Contradiction with Genesis 18:11
This verse states that Abraham and Sarah were old and well stricken in age, implying a contradiction regarding the timing of Isaac's birth.
Genesis 18:11: Now Abraham and Sarah [were] old [and] well stricken in age; [and] it ceased to be with Sarah after the manner of women.
Contradiction with Genesis 17:17
Abraham laughed at the idea of having a son at the age of 100 years, showing skepticism about having a child at an old age, which contrasts with the realization in Genesis 21:5.
Genesis 17:17: Then Abraham fell upon his face, and laughed, and said in his heart, Shall [a child] be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?
Contradiction with Romans 4:19
This verse mentions that Abraham did not consider his own body now dead, contrasted with the emphasis on his age in Genesis 21:5, but underscores faith amidst age constraints.
Romans 4:19: And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara's womb:
Contradiction with Hebrews 11:11
It emphasizes Sarah's faith to conceive despite her age, contrasting with the focus on Abraham's age in Genesis 21:5 as a delay concern.
Hebrews 11:11: Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.