They went out from us, but they were not of us; for if they had been of us, they would have remained with us. But [they went out], in order that it might be shown that all of them are not of us.

not as Cain, who was of the evil one and violently murdered his brother. And {for what reason} did he violently murder him? Because his deeds were evil and the [deeds] of his brother [were] righteous.