And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him. And the LORD said unto Cain, Where is Abel thy brother? And he said, Am I my brother's keeper?... And the LORD said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground... When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth.
Immediately after the Fall comes murder—and not murder of a stranger but of a brother. Sin escalates with terrifying speed. One generation from Eden, human beings kill their own kin.
But notice the details: Cain is a farmer, Abel a shepherd. This is not incidental. Agriculture represents the Neolithic Revolution—the transition to settled civilization. The story may encode an ancient memory: when humans began farming, violence intensified. Settled peoples have territory to defend; they accumulate surplus to steal. Cain, the farmer, kills Abel, the nomad.
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