Revelation 1:17-18

17 When I saw him, I fell at his feet as though dead. But he laid his right hand on me, saying, “Fear not, I am the first and the last, 18 and the living one. I died, and behold I am alive forevermore, and I have the keys of Death and Hades.

Revelation 1:17-18

See the article on “Alpha and Omega, First and Last“.