Adam and Eve have two sons called Cain and Abel
1 Adam had sex with his wife, Eve. She became pregnant. She gave birth to Cain. She said, ‘With the Lord's help, I have given birth to a son.’
2 Some time later, Eve gave birth to Cain's brother. She called him Abel. When they had grown to become men, Abel took care of sheep. Cain worked on the land as a farmer.
3 One day, it was time for the harvest. Cain brought to the Lord some of his crops as an offering. 4 But Abel brought to God some of the first lambs that his sheep had given birth to. He brought pieces of fat from the best of his lambs to offer them to God. Abel and his gift pleased the Lord. 5 But God was not pleased with Cain and his gift. So Cain became very angry. His face looked sad.
4:4The fat pieces are the best parts of the meat from the animal.
6 Then the Lord said to Cain, ‘Why are you angry? Why do you look sad? 7 If you do what is right, I will accept you. But if you do not do the right thing, sin will be very near to you. It will be like a wild animal at your door that is ready to eat you. But you must become its master.’
4:7God told Cain that, if he continued to do wrong things, sin would destroy him.