9 I, John, am your brother and your partner in suffering and in God’s Kingdom and in the patient endurance to which Jesus calls us. I was exiled to the island of Patmos for preaching the word of God and for my testimony about Jesus. 10 It was the Lord’s Day, and I was worshiping in the Spirit.[a] Suddenly, I heard behind me a loud voice like a trumpet blast. 11 It said, “Write in a book[b] everything you see, and send it to the seven churches in the cities of Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia, and Laodicea.”
Revelation 1:9-11
John has been exiled to the island of Patmos by the Romans for sharing the word of God and testimony of Jesus Christ. There on the Lord’s day (Sunday?) while under the influence of the Holy Spirit, John would receive and transcribe the revelation of Jesus Christ.
The once humble voice of Jesus is now loud like a trumpet! Jesus commanded John to write down all he sees and send it to seven churches in Asia. Each church had specific aspects shared by all churches to this day. By sending this perfect message to all churches, they can apply the perfect love and judgment of God to themselves.