Just posting this because of a strange coincidence I had while reading this passage:
GEN 4:9 And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?
GEN 4:10 And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.
GEN 4:11 And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand;
GEN 4:12 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.
GEN 4:13 And Cain said unto the LORD, My punishment is greater than I