1:8

"I am the Alpha and the Omega," 

 "who is, and who was, and who is to come, the Almighty."

 

  1:17b-20

"Do not be afraid. I am the First and the Last. I am the Living One; I was dead, and behold I am alive for ever and ever! And I hold the keys of death and Hades.  "Write, therefore, what you have seen, what is now and what will take place later. The mystery of the seven stars that you saw in my right hand and of the seven golden lampstands is this: The seven stars are the angels of the seven churches, and the seven lampstands are the seven churches."