Revelation 1:8

"I am the Alpha and the Omega," saith the Lord God, Who is, and Who was, and Who is coming, the Almighty.

Revelation 22:13

I am the Alpha and the Omega, the First and the Last, the Beginning and the End.

1 Timothy 3:16

And, confessedly, great is the mystery of godliness; God was manifested in flesh, was justified in the Spirit, was seen by angels, preached among the gentiles, believed on in the world, taken up in glory.

Matthew 25:34

"Then will the King say to those on His right hand, 'Come, ye blessed of My Father! inherit the Kingdom prepared for you from the founding of the world:

Matthew 27:37

And they put over His head His accusation, "THIS IS JESUS THE KING OF THE JEWS."

Revelation 1:11

saying, "What you see, write in a book, and send it to the seven assemblies; to Ephesus, and to Smyrna, and to Pergamum, and to Thyatira, and to Sardis, and to Philadelphia, and to Laodicea."

Revelation 1:17-18

And, when I saw Him, I fell at His feet as dead! And He laid His right hand on me, saying, "Fear not; I am the First and the Last,

Revelation 2:8

"And to the angel of the assembly in Smyrna write these things," saith the First and the Last, Who became dead, and lived:

Treasury of Scripture Knowledge

Summary

Thus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I am the first, and I am the last; and beside me there is no God.

Bible References

I am the first

Revelation 1:8
"I am the Alpha and the Omega," saith the Lord God, Who is, and Who was, and Who is coming, the Almighty.
Revelation 2:8
"And to the angel of the assembly in Smyrna write these things," saith the First and the Last, Who became dead, and lived:
Revelation 22:13
I am the Alpha and the Omega, the First and the Last, the Beginning and the End.

Beside

1 Timothy 3:16
And, confessedly, great is the mystery of godliness; God was manifested in flesh, was justified in the Spirit, was seen by angels, preached among the gentiles, believed on in the world, taken up in glory.

General references

Hebrews 13:8
Jesus Christ is yesterday and today the same??nd forever.
James 2:19
You believe that God is one. You do well. The demons also believe, and shudder!
Revelation 22:13
I am the Alpha and the Omega, the First and the Last, the Beginning and the End.