What sin is Cain remembered for?
Simply so, what is the sin of Cain?
The sin for which Cain ultimately is judged, of course, is the murder of his brother Abel. The story starts with their respective sacrifices: Abel offers prime cuts of lamb from the “firstborn” of his flock (considered to be or to represent the best or choicest), and Cain offers some produce.
Likewise, people ask, what was God's warning to Cain?
His advice to Cain is twofold: 1) Do what is right and you will receive the respect that you want so badly, and 2) Be the master of your own emotions instead of allowing them to be your master. The sin, therefore, that God warns Cain against is nurturing the anger that he feels in his heart against Abel.
Cain, the firstborn, was a farmer, and his brother Abel was a shepherd. The brothers made sacrifices to God, each of his own produce, but God favored Abel's sacrifice instead of Cain's. Cain then murdered Abel, whereupon God punished Cain by condemning him to a life of wandering.