Revelation 3:7

7AndΚαὶtoτῷ[the] messengerἀγγέλῳof theτῆςinἐνPhiladelphiaΦιλαδελφείᾳchurchἐκκλησίαςwriteγράψον·These thingsΤάδεsaysλέγειtheὁHoly [One]ἅγιος,theὁTrue [One]ἀληθινός,ὁhavingἔχωνtheτὴνkeyκλεῖνof DavidΔαυίδ,the [One]ὁopeningἀνοίγωνandκαὶno oneοὐδεὶςwill shutκλείσει,andκαὶshuttingκλείωνandκαὶno oneοὐδεὶςopensἀνοίγει·

And to the angel of the church in Philadelphia write: These things says the Holy One, the True One, having the key of David, the One opening and no one will shut, and shutting and no one opens.