Revelation 3:4-7

But you have a few there in Sardis who have kept their clothes unstained, so they will walk with me and will wear white clothes, because they are worthy. Those who win the victory will be dressed in white clothes like them. And I will not erase their names from the book of life, but I will say they belong to me before my Father and before his angels. Everyone who has ears should listen to what the Spirit says to the churches. “Write this to the angel of the church in Philadelphia: “This is what the One who is holy and true, who holds the key of David, says. When he opens a door, no one can close it. And when he closes it, no one can open it.