“He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.”
King James Version (KJV)
3:8 He that committeth sin is a child of the devil; for the devil sinneth from the beginning - That is, was the first sinner in the universe, and has continued to sin ever since. The Son of God was manifested to destroy the works of the devil - All sin. And will he not perform this in all that trust in him?
1Jo 3:8 He that committeth sin is of the devil. A sinful life is a proof of the devil's power. Christ came to destroy the works of the devil, and it is his work to destroy sin in all his disciples.