https://www.btstories.com/johns-visions/

John was exiled to the island of Patmos for being a follower of Jesus and preaching the word of God. On the Lord’s Day, he was worshiping in the Spirit. Suddenly he heard a loud voice behind him. It sounded like a trumpet blast that said, “You are going to see amazing things. Write all of it in a book and send it to the seven churches of Asia.”