Genesis 4:2-12

2 Then she gave birth to another child, Abel, Cain's brother. Abel was a shepherd, and Cain was a farmer.
3 Later Cain brought some crops from the land as an offering to the LORD.
4 Abel also brought some choice parts of the firstborn animals from his flock. The LORD approved of Abel and his offering,
5 but he didn't approve of Cain and his offering. So Cain became very angry and was disappointed.
6 Then the LORD asked Cain, "Why are you angry, and why do you look disappointed?
7 If you do well, won't you be accepted? But if you don't do well, sin is lying outside your door ready to attack. It wants to control you, but you must master it."
8 Cain talked to his brother Abel. Later, when they were in the fields, Cain attacked his brother Abel and killed him.
9 The LORD asked Cain, "Where is your brother Abel?" "I don't know," he answered. "Am I supposed to take care of my brother?"
10 The LORD asked, "What have you done? Your brother's blood is crying out to me from the ground.
11 So now you are cursed from the ground, which has received the blood of your brother whom you killed.
12 When you farm the ground, it will no longer yield its best for you. You will be a fugitive, a wanderer on the earth."