Revelation 2:8-10

8And to the angel of the church in Smyrna write; These things saith the first and the last, which was dead, and lived again:

9I know thy tribulation, and thy poverty (but thou art rich), and the blasphemy of them which say they are Jews, and they are not, but are a synagogue of Satan.

10Fear not the things which thou art about to suffer: behold, the devil is about to cast some of you into prison, that ye may be tried; and ye shall have tribulation ten days. Be thou faithful unto death, and I will give thee the crown of life.