Revelation 1:10-11

10On the Lord's day, God's Spirit caused me to see and to hear things. I heard a voice speak behind me. The sound was as loud as a trumpet.

11The voice said: ‘When you see these things, write them in a book. Then you must send the book to the seven churches in these cities: Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia, Laodicea.’