'Key' in the Bible

And they waited till they were utterly at a loss; but when he still did not open the doors of the roof chamber, they took the key and opened them; and there lay their lord dead on the floor.

And the key of the house of David will I lay upon his shoulder; and he shall open, and none shall shut; and he shall shut, and none shall open.

Woe unto you, the doctors of the law, for ye have taken away the key of knowledge; yourselves have not entered in, and those who were entering in ye have hindered.

And to the angel of the assembly in Philadelphia write: These things saith the holy, the true; he that has the key of David, he who opens and no one shall shut, and shuts and no one shall open:

And the fifth angel sounded his trumpet: and I saw a star out of the heaven fallen to the earth; and there was given to it the key of the pit of the abyss.

And I saw an angel descending from the heaven, having the key of the abyss, and a great chain in his hand.