Genesis 4:8
"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."
Cross References (ranked by relevance)
That upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar.
Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the gainsaying of Core.
From the blood of Abel unto the blood of Zacharias, which perished between the altar and the temple: verily I say unto you, It shall be required of this generation.
And thy handmaid had two sons, and they two strove together in the field, and there was none to part them, but the one smote the other, and slew him.
And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel.
For the son dishonoureth the father, the daughter riseth up against her mother, the daughter in law against her mother in law; a man’s enemies are the men of his own house.
The words of his mouth were smoother than butter, but war was in his heart: his words were softer than oil, yet were they drawn swords.
The words of his mouth are iniquity and deceit: he hath left off to be wise, and to do good.
For then shalt thou lift up thy face without spot; yea, thou shalt be stedfast, and shalt not fear:
That Sanballat and Geshem sent unto me, saying, Come, let us meet together in some one of the villages in the plain of Ono. But they thought to do me mischief.
And when Abner was returned to Hebron, Joab took him aside in the gate to speak with him quietly, and smote him there under the fifth rib, that he died, for the blood of Asahel his brother.
Surely thou wilt slay the wicked, O God: depart from me therefore, ye bloody men.
But Jesus said unto him, Judas, betrayest thou the Son of man with a kiss?