Revelation 1:18-20

18the Living One. I was dead, and behold, now I am alive forever and ever! And I hold the keys of Death and of Hades.

19Therefore write down the things you have seen, the things that are, and the things that will happen after this. 20This is the mystery of the seven stars you saw in My right hand and of the seven golden lampstands: The seven stars are the angels of the seven churches, and the seven lampstands are the seven churches.