(I dont remember the exact to qoute so corecct me if im wrong.)
In the bible cain kills abel and gets banished. God gives him a mark so that no other humans can kill him.
What other humans? Adam and eve gave birth to cain and abel and other than that there were no other humans right?
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[i] *puts on an antic disposition* [/i] Adam and Eve have birth to a whole bunch of kids, who then banged their mother and each other.