Rev1:11 Saying, What you see, put in a book, and send it to the seven churches; to Ephesus and to Smyrna and to Pergamos and to Thyatira and to Sardis and to Philadelphia and to Laodicea.
Rev3:1 And to the angel of the church in Sardis say: These things says he who has the seven Spirits of God and the seven stars: I have knowledge of your works, that you seem to be living but are dead.
Rev3:4 But you have some names in Sardis who have kept clean their robes; and as a reward they will go in white with me.