Revelation 2:9-10

‘I know your suffering and your poverty (but you are rich), and how you are blasphemed and slandered by those who say they are Jews and are not, but are a synagogue of Satan [they are Jews only by blood, and do not believe and truly honor the God whom they claim to worship]. Fear nothing that you are about to suffer. Be aware that the devil is about to throw some of you into prison, that you may be tested [in your faith], and for ten days you will have tribulation. Be faithful to the point of death [if you must die for your faith], and I will give you the crown [consisting] of life. [Rev 3:10, 11]