1 John 3:8-12
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8the one who practices sin is of the devil; for the devil has been sinning from the beginning. The Son of God appeared for this purpose, to destroy the works of the devil. 9No one who has been born of God practices sin, because His seed remains in him; and he cannot sin continually, because he has been born of God. 10By this the children of God and the children of the devil are obvious: anyone who does not practice righteousness is not of God, nor the one who does not love his brother and sister.
11For this is the message which you have heard from the beginning, that we are to love one another; 12not as Cain, who was of the evil one and murdered his brother. And for what reason did he murder him? Because his own deeds were evil, but his brother’s were righteous.