The Book of Revelation 3

The time has come for you to step into the light and to listen, hear and heed what the spirit says to the churches of Sardis, Philadelphia, and Laodicea. “To Sardis, I will come upon you as a thief, and you will not know what hour I will come, to Philadelphia, because you have kept my command, I will keep you from the hour of trails to test those on earth, and to Laodicea, I stand at the door and knock, if anyone hears my voice and opens the door, and I will be with him and him with Me.