Chp. 4 verse 5 - Chp. 6 verse 8: Hashem did not accept Kayin's offering and he was upset. Kayin kills his brother and Hashem condemns him to wander for seven generations until he will die. Lemech kills Kayin. Adam reconciles with Chavah and she gives birth to Sheis. Mankind continues to increase. There are ten generations form Adam to Noach, which included two righteous individuals, Chanoch and Mesushelech. However, most of mankind practiced immorality and violence. Hashem questioned His decision to create mankind, however Noach found favor in His eyes.