Who was of the wicked one — Who showed he was a child of the devil by killing his brother. And wherefore slew he him — For any fault? No, but just the reverse; for his goodness.
Related Commentaries of 1 John 3:12
1 John 3:12
12 Not as Cain, who was of that wicked one, and slew his brother. And wherefore slew he him? Because his own works were evil, and his brother's righteous.