When Abel gave his baby lambs to God, they were accepted.
But when Cain gave God some vegetables, they were rejected.
Cain was jealous so he grabbed a rock and beat poor Abel to death.
He tried to hide it from God but God knew that Abel had taken his final breath.

God banished Cain from the land and he was cursed.
God put a mark on him that said if anybody harmed him, they'd get seven times worse.
Poor Abel must have been really scared as he was dying.
When a man kills his own brother, it's truly terrifying.