We must not be like Cain, who belonged to the evil one and murdered his brother. And why did he murder him? Because his own deeds were evil, and his brother’s were righteous.
In context
10This is how the children of God and the children of the devil become obvious: whoever does not do what is right is not of God, and neither is whoever does not love his brother or sister. 11For this is the message you heard from the beginning: that we should love one another. 12We must not be like Cain, who belonged to the evil one and murdered his brother. And why did he murder him? Because his own deeds were evil, and his brother’s were righteous. 13And do not be surprised, brothers and sisters, if the world hates you. 14We know that we have passed from death to life, because we love our brothers and sisters. Whoever does not love remains in death.
