Revelation 2:9

2:9 ‘I know the distress you are suffering and your poverty (but you are rich). I also know the slander against you by those who call themselves Jews and really are not, but are a synagogue of Satan.

Revelation 12:9

12:9 So that huge dragon – the ancient serpent, the one called the devil and Satan, who deceives the whole world – was thrown down to the earth, and his angels along with him.