Revelation 3:7-8

And to the angel of the church in Philadelphia write, “These thing says He who is holy, He who is true, “He who has the key of David, He who opens and no one shuts, and shuts and no one opens”:  “I know your works.  See, I have set before you an open door, and no one can shut it; for you have a little strength, have kept My word, and have not denied My name.