Luke 11:51
from the blood of Abel to the blood of Zechariah, who was slain between the altar and the temple. Yea, I tell you, it will be required of this generation.
John 8:44
Ye are of your father the Devil, and what your father desireth ye are ready to do. He was a murderer from the beginning; and he abideth not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh from his own nature; for he is a liar, and the father of it.
1 John 3:10
In this are manifest the children of God and the children of the Devil. Whoever doeth not righteousness is not of God, and he that loveth not his brother.
1 John 3:12
not as Cain was of the Evil One, and slew his brother. And wherefore did he slay him? Because his own works were evil, and his brothers righteous.
1 John 3:15
Whoever hateth his brother is a murderer; and ye know that no murderer hath everlasting life abiding in him.