Cain! CAIN! You know my voice? Of course i do, you are the lord why do you call me? Tell me Cain where is your brother Abel? How should i know lord i'm i perhaps my brother's keeper? What have you done Cain?
Cain was the older brother of Abel and the son of Adam and Eve when God did not honor his offer to him (because what he offered was cursed from the poisoned ground) which resulted in him murdering his older brother Abel.