NET
8 The one who practices sin is of the devil, because the devil has been sinning from the beginning. For this purpose the Son of God was revealed: to destroy the works of the devil.
Darby
8 He that practises sin is of the devil; for from [the] beginning the devil sins. To this end the Son of God has been manifested, that he might undo the works of the devil.
KJV
8 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.