'Key' in the Bible

The servants waited until they became worried and saw that he had still not opened the doors of the upstairs room. So they took the key and opened the doors—and there was their lord lying dead on the floor!

I will place the key of the House of David on his shoulder; what he opens, no one can close; what he closes, no one can open.

“Woe to you experts in the law! You have taken away the key of knowledge! You didn’t go in yourselves, and you hindered those who were going in.”

“Write to the angel of the church in Philadelphia:“The Holy One, the True One, the One who has the key of David, who opens and no one will close, and closes and no one opens says:

The fifth angel blew his trumpet, and I saw a star that had fallen from heaven to earth. The key to the shaft of the abyss was given to him.

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