Revelation 1:18-22

and the living One; and I was dead, and behold, I am alive forevermore, and I have the keys of death and of Hades.

Therefore write the things which you have seen, and the things which are, and the things which will take place after these things.

As for the mystery of the seven stars which you saw in My right hand, and the seven golden lampstands: the seven stars are the angels of the seven churches, and the seven lampstands are the seven churches.