Revelation 1:4, 8, 17-18

John to the seven churches that are in Asia: Grace to you and peace, from him who is and who was and who is to come; and from the seven Spirits that are before his throne

I am the Alpha and the Omega, saith the Lord God, who is and who was and who is to come, the Almighty.

And when I saw him, I fell at his feet as one dead. And he laid his right hand upon me, saying, Fear not; I am the first and the last, and the Living one; and I was dead, and behold, I am alive for evermore, and I have the keys of death and of Hades.