Revelation 3:7-8

This is what you must write to the angel of the church in Philadelphia: I am the one who is holy and true, and I have the keys that belonged to David. When I open a door, no one can close it. And when I close a door, no one can open it. Listen to what I say. I know everything you have done. And I have placed before you an open door no one can close. You were not very strong, but you obeyed my message and did not deny you are my followers.