1 Bible Verses about Doorkeepers

And by the messenger of the congregation in Philadelphia, write: These things says the Holy One, the True One; who has the key, the Son of David; he who opens and no man shuts; and shuts, and no man opens: I know your works: behold, I have set before you an open door, and no man can shut it; because you have little strength, and have kept my word, and have not denied my name.