Genesis 4:8

And Cain (the man or terrestrial mind) talked with Abel (the human soul or heavenly man) his brother: and it came to pass, when they (the mind and the soul) were (together within the physical body) in the field (of Yesod), that Cain (the man or terrestrial mind) rose up (or polarized negatively) against Abel (the human soul or heavenly man) his brother, and (through fornication) slew him.