Revelation 3:1-6 (NIV)
To the Church in Sardis
3 “To the angel of the church in Sardis write:
These are the words of him who holds the seven spirits of God and the seven stars. I know your deeds; you have a reputation of being alive, but you are dead. 2 Wake up! Strengthen what remains and is about to die, for I have found your deeds unfinished in the sight of my God. 3 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.
4 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. 5 The one who is victorious will, like them, be dressed in white. I will never blot out the name of that person from the book of life, but will acknowledge that name before my Father and his angels. 6 Whoever has ears, let them hear what the Spirit says to the churches.