Genesis 4:7-9

New Revised Standard Version Catholic Edition

⁷ If you do well, will you not be accepted? And if you do not do well, sin is lurking at the door; its desire is for you, but you must master it.”

⁸ Cain said to his brother Abel, “Let us go out to the field.”^[a] And when they were in the field, Cain rose up against his brother Abel, and killed him. ⁹ Then the Lord said to Cain, “Where is your brother Abel?” He said, “I do not know; am I my brother’s keeper?”