Revelation 1:8:
8 “I am the Alpha and the Omega, the Beginning and the End,” says the Lord, “who is and who was and who is to come, the Almighty.”

Revelation 1:10-11:
10 I was in the Spirit on the Lord’s Day, and I heard behind me a loud voice, as of a trumpet,
11 saying, “I am the Alpha and the Omega, the First and the Last,” and, “What you see, write in a book and send it to the seven churches which are in Asia: to Ephesus, to Smyrna, to Pergamos, to Thyatira, to Sardis, to Philadelphia, and to Laodicea.”

Revelation 1:17-18:
17 And when I saw Him, I fell at His feet as dead. But He laid His right hand on me, saying to me, “Do not be afraid; I am the First and the Last.
18 I am He who lives, and was dead, and behold, I am alive forevermore. Amen. And I have the keys of Hades and of Death.

Revelation 2:8:
8 “And to the angel of the church in Smyrna write,
‘These things says the First and the Last, who was dead, and came to life:"

Revelation 22:13:
13 I am the Alpha and the Omega, the Beginning and the End, the First and the Last.

Isaiah 25:8:
He will swallow up death forever,
And the Lord God will wipe away tears from all faces;
The rebuke of His people
He will take away from all the earth;
For the Lord has spoken.

Isaiah 41:4:
Who has performed and done it,
Calling the generations from the beginning?
‘I, the Lord, am the first;
And with the last I am He.’ ”

Isaiah 44:6:
“Thus says the Lord, the King of Israel,
And his Redeemer, the Lord of hosts:
‘I am the First and I am the Last;
Besides Me there is no God.

Isaiah 48:12:
“Listen to Me, O Jacob,
And Israel, My called:
I am He, I am the First,
I am also the Last.