Genesis 4:3-8

3In the course of time Cain brought to the Lord an offering of the fruit of the ground,

4and Abel also brought of the firstborn of his flock and of their fat portions. And the Lord had regard for Abel and his offering,

5but for Cain and his offering he had no regard. So Cain was very angry, and his face fell.

6The Lord said to Cain, "Why are you angry, and why has your face fallen?

7If you do well, will you not be accepted? And if you do not do well, sin is crouching at the door. Its desire is contrary to you, but you must rule over it."

8Cain spoke to Abel his brother. And when they were in the field, Cain rose up against his brother Abel and killed him.