Luke 11:51
Yes, I tell you that, from the blood of Abel down to the blood of Zechariah who perished between the altar and the House, it shall all be required from the present generation.
John 8:44
The father whose sons you are is the Devil; and you desire to do what gives him pleasure. *He* was a murderer from the beginning, and does not stand firm in the truth--for there is no truth in him. Whenever he utters his lie, he utters it out of his own store; for he is a liar, and the father of lies.
1 John 3:10
By this we can distinguish God's children and the Devil's children: no one who fails to act righteously is a child of God, nor he who does not love his brother man.
1 John 3:12
We are not to resemble Cain, who was a child of the Evil one and killed his own brother. And why did he kill him? Because his own actions were wicked and his brother's actions righteous.
1 John 3:15
Every one who hates his brother man is a murderer; and you know that no murderer has the Life of the Ages continuing in him.