Genesis 4 is about Cain and Abel and the evidence of the sin nature which descended down to all mankind as a consequence of the "fall". Cain acted out of jealous anger and indifference to the Lord in the murder of his brother. Cain's hardened behavior and response to the Lord's correction lead to even greater punishment, yet the Lord showed compassion and grace in His protection of Cain's life. The chapter closes with the birth of Seth, "God has granted me another son in place of Abel, the one Cain killed". We are told that Seth had a son, Enosh, and "during his lifetime the people first began to worship the Lord".