William Barclay's Daily Study Bible - 1 John 3:3-8
3:3-8 Anyone who rests this hope on him purifies himself as he is pure. Anyone who commits sin commits lawlessness, and sin is lawlessness. And you know that he appeared that he might take away our sins and there is no sin in him. Anyone who abides in him does not sin. Anyone who sins has not seen him, and does not know him. Little children, let no one deceive you. He who does righteousness is righteous, even as he is righteous. He who does sin is of the devil, because the devil is a sinner... read more
Matthew Henry's Complete Commentary - 1 John 3:4-10
The apostle, having alleged the believer's obligation to purity from his hope of heaven, and of communion with Christ in glory at the day of his appearance, now proceeds to fill his own mouth and the believer's mind with multiplied arguments against sin, and all communion with the impure unfruitful works of darkness. And so he reasons and argues, I. From the nature of sin and the intrinsic evil of it. It is a contrariety to the divine law: Whosoever committeth sin transgresseth also (or even)... read more