What was the mark mentioned in Genesis 4:15 that God put on CainFirstborn son of Adam and Eve (Genesis 4:1), he was a farmer, or tiller of the ground. He committed the first recorded murder when he killed his younger brother, Abel (Genesis 4:8). After the murder of his brother, Cain settled in the land of Nod, east of Eden. after CainFirstborn son of Adam and Eve (Genesis 4:1), he was a farmer, or tiller of the ground. He committed the first recorded murder when he killed his younger brother, Abel (Genesis 4:8). After the murder of his brother, Cain settled in the land of Nod, east of Eden. killed his brother AbelThe second born son of Adam and Eve, he was a shepherd (Genesis 4:2). He was murdered by his brother Cain (Genesis 4:8).?