Todo Curioso

⁶ Then the LORD said to Cain, "Why are you angry? Why is your face downcast?
⁷ If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must master it."
⁸ Now Cain said to his brother Abel, "Let's go out to the field."
And while they were in the field, Cain attacked his brother Abel and killed him.
⁹ Then the LORD said to Cain, "Where is your brother Abel?"
"I don't know," he replied. "Am I my brother's keeper?"

Genesis 4: 6-9