Isaiah 22:22

22:22 I will place the key to the house of David on his shoulder. When he opens the door, no one can close it; when he closes the door, no one can open it.

Revelation 1:18

1:18 and the one who lives! I was dead, but look, now I am alive – forever and ever – and I hold the keys of death and of Hades!

Revelation 3:7

To the Church in Philadelphia

3:7 “To the angel of the church in Philadelphia write the following:

“This is the solemn pronouncement of the Holy One, the True One, who holds the key of David, who opens doors no one can shut, and shuts doors no one can open:

Revelation 9:1

9:1 Then the fifth angel blew his trumpet, and I saw a star that had fallen from the sky to the earth, and he was given the key to the shaft of the abyss.

Revelation 20:1-3

The Thousand Year Reign

20:1 Then I saw an angel descending from heaven, holding in his hand the key to the abyss and a huge chain. 20:2 He seized the dragon – the ancient serpent, who is the devil and Satan – and tied him up for a thousand years. 20:3 The angel then threw him into the abyss and locked and sealed it so that he could not deceive the nations until the one thousand years were finished. (After these things he must be released for a brief period of time.)