Luke 11:51

who perished between the altar and the temple. Verily I tell you, it shall be required of this generation.

John 8:44

Ye are of your father the devil, and are bent upon doing the lusts of your father: he was a murderer from the beginning, and continued not in the truth: for there is no truth in him. When he speaketh a lie, he speaketh like himself, for he is a liar, and the father of such.

1 John 3:10

In this the children of God are manifest, and the children of the devil: whosoever doth not practise righteousness, and he who loveth not his brother, is not of God:

1 John 3:12

and why did he slay him? because his own works were evil, and his brother's righteous.

1 John 3:15

Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.

Treasury of Scripture Knowledge

Summary

And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground.

Bible References

A keeper

John 8:44
Ye are of your father the devil, and are bent upon doing the lusts of your father: he was a murderer from the beginning, and continued not in the truth: for there is no truth in him. When he speaketh a lie, he speaketh like himself, for he is a liar, and the father of such.
1 John 3:10
In this the children of God are manifest, and the children of the devil: whosoever doth not practise righteousness, and he who loveth not his brother, is not of God: