'Synagogue of Satan' in the Bible

I know your works, and tribulation, and poverty, (but you are rich) and I know the blasphemy of them who say they are Jews, and are not, but are the synagogue of Satan.

Behold, I will make them of the synagogue of Satan, who say they are Jews, and are not, but do lie; behold, I will make them to come and worship before your feet, and to know that I have loved you.