1 John 3:10, 14-15

So we can see who God’s children are and who the devil’s children are: Those who do not do what is right are not God’s children, and those who do not love their brothers and sisters are not God’s children.

We know we have left death and have come into life because we love each other. Whoever does not love is still dead. Everyone who hates a brother or sister is a murderer, and you know that no murderers have eternal life in them.