Luke 11:51
From the blood of Abel down to the blood of Zechariah, who was slain between the altar and the House of God." Yes, I tell you, it will be exacted from this generation.
John 8:44
As for you, you are children of your Father the Devil, and you are determined to do what your father loves to do. He was a murderer from the first, and did not stand by the truth, because there is no truth in him. Whenever he lies, he does what is natural to him; because he is a liar, and the father of lying.
1 John 3:10
By this the Children of God are distinguished from the Children of the Devil--No one who lives unrighteously comes from God, and especially the man who does not love his Brother.
1 John 3:12
We must not be like Cain, who belonged to the Evil One and killed his brother. And why did he kill him? It was because his life was bad while his brother's was good.
1 John 3:15
Every one who hates his Brother is a murderer; and you know that no murderer has Immortal Life within him.