Isn't the world's oldest hate brother on brother?
Weren't Cain and Able Jews? I guess Jews hating Jews isn't uncommon either.
Oh well, never mind. One day I will read the article before posting.
5.56mm
“Weren’t Cain and Able Jews?”
Nope.
Depending on how you count who is a “Jew” there weren’t any Jewish people until either Abraham or Moses (again, depending on your definition — descendant of Abraham or Coveneant of Mt. Sinai).
(That said, somehow Noah knew what was a clean and unclean animal and took on more clean.)
Anyway, all long after Cain and Able.