Revelation 3:9
Look at those who belong to the synagogue of Satan [See 2:9]; they claim to be Jews, yet they are not, but are lying. Watch, I will make them come and bow down at your feet [in respect] and [they will] know that I have loved you.
Revelation 2:9
I know [about] your suffering and your poverty (but you are [really] rich), and the slander of those who say they are Jews, though they [really] are not, but are a synagogue of Satan [i.e., they claimed to be an assembly of God's people, but in reality were serving Satan].
Acts 16:37-39
But Paul responded to the officials, "These city officials had us innocent Roman citizens publicly beaten and thrown in jail. Are they now trying to release us privately? No indeed! Let the officials themselves come and [publicly] release us."