And when king David had heard about these things, he was deeply grieved. But he was not willing to afflict the spirit of his son Amnon. For he loved him, since he was his firstborn.
But whoever hates his brother is in the darkness, and in darkness he walks, and he does not know where he is going. For the darkness has blinded his eyes.
In this way, the sons of God are made manifest, and also the sons of the devil. Everyone who is not just, is not of God, as also anyone who does not love his brother.
Do not be like Cain, who was of the evil one, and who killed his brother. And why did he kill him? Because his own works were wicked, but his brother's works were just.