κλείς

Woe to you experts in the law! For you have taken away the key to knowledge. You yourselves have not entered, and you have hindered those who were entering.”

I will give you the keys of the kingdom of heaven. Whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.”

the Living One. I was dead, and behold, now I am alive forever and ever! And I hold the keys of Death and of Hades.

Then I saw an angel coming down from heaven with the key to the Abyss, holding in his hand a great chain.

To the angel of the church in Philadelphia write:These are the words of the One who is holy and true, who holds the key of David. What He opens no one can shut, and what He shuts no one can open.