Genesis 4:3-5

New Revised Standard Version Catholic Edition

³ In the course of time Cain brought to the Lord an offering of the fruit of the ground, ⁴ and Abel for his part brought of the firstlings of his flock, their fat portions. And the Lord had regard for Abel and his offering, ⁵ but for Cain and his offering he had no regard. So Cain was very angry, and his countenance fell.