Revelation 1:18

yea, the ever-living One. I once was dead, but now I live forever and ever. I carry the keys of death and the underworld.

Romans 6:9

for we know that Christ, who once was raised from the dead, will never die again; death has no more power over Him.

Hebrews 7:25

Therefore, because He Himself lives always to intercede for them always, He is able to save completely any and all who come to God through Him.

Revelation 4:9

And whenever the living creatures offer glory, honor, and thanksgiving to Him who is seated on the throne, to Him who lives forever and ever,

Revelation 9:1

Then the fifth angel blew his trumpet, and I saw a star that had fallen from the sky upon the earth. To this angel the key to the pit of the abyss was given,

Matthew 16:19

I will give you the keys of the kingdom of heaven, and whatever you forbid on earth must be what is already forbidden in heaven, and whatever you permit on earth must be what is already permitted in heaven."

Hebrews 1:3

He is the reflection of God's glory and the perfect representation of His being, and continues to uphold the universe by His mighty word. After He had procured man's purification from sins, He took His seat at the right hand of God's majesty,

Hebrews 12:2

keeping our eyes on Jesus, the perfect leader and example of faith, who, instead of the joy which lay before Him, endured the cross with no regard for its shame, and since has taken His seat at the right hand of the throne of God.

Revelation 3:7

"To the messenger of the church in Philadelphia write: 'The Holy and True One, who carries the keys of David, who opens and no one can shut, who shuts and no one can open, speaks as follows:

Revelation 20:14

Then death and the underworld were hurled into the fiery lake, This is the second death -- the fiery lake.

John 14:19

In just a little while the world will not see me any more, but you will be seeing me. Because I am to live on, you too will live on.

Romans 14:8-9

indeed, if we live, we always live in relation to the Lord, and if we die, we always die in relation to the Lord. So whether we live or die we belong to the Lord.

2 Corinthians 5:14-15

For the love of Christ continuously constrains me, because I am convinced that as One died for all, all have died,

2 Corinthians 13:4

For though He was crucified in weakness, yet by the power of God He goes on living. We too, indeed, show weakness through our union with Him, yet by the power of God we too shall be alive toward you through fellowship with Him.

Galatians 2:20

I have been crucified with Christ, and I myself no longer live, but Christ is living in me; the life I now live as a mortal man I live by faith in the Son of God who loved me and gave Himself for me.

Colossians 3:3

for you have died, and your life is now hidden in God through your fellowship with Christ.

Hebrews 7:16

who is appointed not on the basis of a physical qualification but on the basis of a power flowing from a life that cannot end.

Revelation 5:14

Then the four living creatures said, "Amen!" And the elders fell down and worshiped.

Revelation 20:1-2

Then I saw an angel coming down from heaven with the key of the abyss and a great chain in his hand.

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

That liveth

John 14:19
In just a little while the world will not see me any more, but you will be seeing me. Because I am to live on, you too will live on.
Romans 6:9
for we know that Christ, who once was raised from the dead, will never die again; death has no more power over Him.
2 Corinthians 13:4
For though He was crucified in weakness, yet by the power of God He goes on living. We too, indeed, show weakness through our union with Him, yet by the power of God we too shall be alive toward you through fellowship with Him.
Galatians 2:20
I have been crucified with Christ, and I myself no longer live, but Christ is living in me; the life I now live as a mortal man I live by faith in the Son of God who loved me and gave Himself for me.
Colossians 3:3
for you have died, and your life is now hidden in God through your fellowship with Christ.
Hebrews 7:25
Therefore, because He Himself lives always to intercede for them always, He is able to save completely any and all who come to God through Him.

Was

Romans 14:8
indeed, if we live, we always live in relation to the Lord, and if we die, we always die in relation to the Lord. So whether we live or die we belong to the Lord.
2 Corinthians 5:14
For the love of Christ continuously constrains me, because I am convinced that as One died for all, all have died,
Hebrews 1:3
He is the reflection of God's glory and the perfect representation of His being, and continues to uphold the universe by His mighty word. After He had procured man's purification from sins, He took His seat at the right hand of God's majesty,
Hebrews 12:2
keeping our eyes on Jesus, the perfect leader and example of faith, who, instead of the joy which lay before Him, endured the cross with no regard for its shame, and since has taken His seat at the right hand of the throne of God.

I am alive

Revelation 4:9
And whenever the living creatures offer glory, honor, and thanksgiving to Him who is seated on the throne, to Him who lives forever and ever,
Revelation 5:14
Then the four living creatures said, "Amen!" And the elders fell down and worshiped.
Hebrews 7:16
who is appointed not on the basis of a physical qualification but on the basis of a power flowing from a life that cannot end.

The keys

Revelation 3:7
"To the messenger of the church in Philadelphia write: 'The Holy and True One, who carries the keys of David, who opens and no one can shut, who shuts and no one can open, speaks as follows:
Revelation 9:1
Then the fifth angel blew his trumpet, and I saw a star that had fallen from the sky upon the earth. To this angel the key to the pit of the abyss was given,
Revelation 20:1
Then I saw an angel coming down from heaven with the key of the abyss and a great chain in his hand.
Matthew 16:19
I will give you the keys of the kingdom of heaven, and whatever you forbid on earth must be what is already forbidden in heaven, and whatever you permit on earth must be what is already permitted in heaven."

General references

1 Corinthians 15:13
If there is no resurrection of the dead, then Christ has not been raised,
Hebrews 13:8
Jesus Christ is the same yesterday and today, yes, forever.