Revelation 3:7-8

MSB(i) 7 To the angel of the church in Philadelphia write: These are the words of the One who is holy and true, who holds the key of David. What He opens no one can shut (except Him who opens) and no one can open. 8 I know your deeds. See, I have placed before you an open door, which no one can shut. For you have only a little strength, yet you have kept My word and have not denied My name.