Genesis 4:4-8

4Abel also brought of the firstborn of his flock and of their fat. And the Lord respected Abel and his offering,

5but He did not respect Cain and his offering. And Cain was very angry, and his countenance fell.

6So the Lord said to Cain, “Why are you angry? And why has your countenance fallen?

7If you do well, will you not be accepted? And if you do not do well, sin lies at the door. And its desire is for you, but you should rule over it.”

8Now Cain talked with Abel his brother; and it came to pass, when they were in the field, that Cain rose up against Abel his brother and killed him.