In Isaiah 44:6, the Bible says:

"Thus says the LORD, the King of Israel and his Redeemer, the LORD of hosts: 'I am the first and I am the last, And there is no God besides Me.

And in Revelation 1:17-18, John in his vision:

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

"I am the First and the Last"