1 John 3:10, 14-15

In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.

We know that we have passed out of death into life, because we love the brethren. He that loveth not abideth in death. Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.