Genesis 4:3-5

3 So it came about in the course of time that Cain brought an offering to the Lord of the fruit of the ground. 4 Abel, on his part also brought of the firstlings of his flock and of their fat portions. And the Lord had regard for Abel and for his offering; 5 but for Cain and for his offering He had no regard. So Cain became very angry and his countenance fell.