Genesis 4:7-9

New Revised Standard Version, Anglicised

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?’