Revelation 3:2-4

Wake up! Strengthen what remains and is about to die, for I have found your deeds unfinished in the sight of my God. Remember, therefore, what you have received and heard; hold it fast, and repent. But if you do not wake up, I will come like a thief, and you will not know at what time I will come to you. Yet you have a few people in Sardis who have not soiled their clothes. They will walk with me, dressed in white, for they are worthy.