Love one another...
For this is the original message we heard: We should love each other.
We must not be like Cain, who joined the Evil One and then killed his brother. And why did he kill him? Because he was deep in the practice of evil, while the acts of his brother were righteous. So don't be surprised, friends, when the world hates you. This has been going on a long time.
The way we know we've been transferred from death to life is that we love our brothers and sisters. Anyone who doesn't love is as good as dead. Anyone who hates a brother or sister is a murderer, and you know very well that eternal life and murder don't go together.
This is how we've come to understand and experience love: Christ sacrificed his life for us. This is why we ought to live sacrificially for our fellow believers, and not just be out for ourselves.
1 John 3:11-16 The Message