'Seven Churches' in the Bible

From John to the seven churches that are in Asia the Roman Province. Grace to you, and peace from Him that is and was and is to be, and from the Seven Spirits that are before his throne,

saying, "Write in a book what you see, and send it to the seven churches; to Ephesus and to Smyrna and to Pergamos and to Thyatira and Sardis and Philadelphia and Laodicea."

The mystery of the seven stars which you saw in my right hand, and the seven golden candlesticks, is this. The seven stars are the angels of the seven churches, and the seven candlesticks are the seven churches."