Genesis 4:1-8

The man had intercourse with his wife Eve, and she conceived and gave birth to Cain, saying, “I have produced a male child with the help of the LORD.” Next she gave birth to his brother Abel. Abel became a herder of flocks, and Cain a tiller of the ground. In the course of time Cain brought an offering to the LORD from the fruit of the ground, while Abel, for his part, brought the fatty portion of the firstlings of his flock. The LORD looked with favor on Abel and his offering, but on Cain and his offering he did not look with favor. So Cain was very angry and dejected. Then the LORD said to Cain: Why are you angry? Why are you dejected? If you act rightly, you will be accepted; but if not, sin lies in wait at the door: its urge is for you, yet you can rule over it. Cain said to his brother Abel, “Let us go out in the field.” When they were in the field, Cain attacked his brother Abel and killed him.