Strong G1228 διάβολος diabolos · devilish/the Devil

1 John

1. 1 John 3:8
   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.
2. 1 John 3:10
   In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.