Revelation 1:4

1:4 From John, to the seven churches that are in the province of Asia: Grace and peace to you from “he who is,” and who was, and who is still to come, and from the seven spirits who are before his throne,

Revelation 1:8

1:8 “I am the Alpha and the Omega,” says the Lord God – the one who is, and who was, and who is still to come – the All-Powerful!

Revelation 1:17-18

1:17 When I saw him I fell down at his feet as though I were dead, but he placed his right hand on me and said: “Do not be afraid! I am the first and the last, 1:18 and the one who lives! I was dead, but look, now I am alive – forever and ever – and I hold the keys of death and of Hades!