Genesis 4:8-10

One day Cain suggested to his brother, “Let’s go out into the fields.” And while they were in the field, Cain attacked his brother, Abel, and killed him. Afterward the LORD asked Cain, “Where is your brother? Where is Abel?” “I don’t know,” Cain responded. “Am I my brother’s guardian?” But the LORD said, “What have you done? Listen! Your brother’s blood cries out to me from the ground!