Revelation 1:18-20

18and the Ever-living One [living in and beyond all time and space]. I died, but see, I am alive forevermore, and I have the keys of [absolute control and victory over] death and of Hades (the realm of the dead).

19So write the things which you have seen [in the vision], and the things which are [now happening], and the things which will take place after these things.

20As 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 (divine messengers) of the seven churches, and the seven lampstands are the seven churches.