Genesis 4:8-10 KJV

8 And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.

9 And the Lord said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?

10 And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.