Revelation 1:11 saying, " What you see, write in a book and send to the seven assemblies : to Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia, and to Laodicea." (WEB KJV WEY ASV BBE DBY WBS YLT NAS RSV NIV)
Revelation 3:1 "And to the angel of the assembly in Sardis write: "He who has the seven Spirits of God, and the seven stars says these things: "I know your works, that you have a reputation of being alive, but you are dead. (WEB KJV WEY ASV BBE DBY WBS YLT NAS RSV NIV)
Revelation 3:4 Nevertheless you have a few names in Sardis that did not defile their garments. They will walk with me in white, for they are worthy. (WEB KJV WEY ASV BBE DBY WBS YLT NAS RSV NIV)