Cain Killing Abel, Lucas van Leyden

Public domain scan of Dutch print from Metropolitan Museum of Art, free to use, no copyright restrictions - Picryl description

Cain and Abel - the first two sons of Adam and Eve. According to the book of Genesis, Cain, a farmer, became jealous of Abel, a shepherd, when God accepted Abel's offering of animal sacrifice but rejected Cain's offering of crops. In a fit of anger, Cain killed Abel, making him the first murderer in human history. God punished Cain by marking him and banishing him from the land.