Revelation Chapter 1
Verse 11(NASB) 
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11. saying, "Write in a book what you see, and send it to the seven churches: to Ephesus and to Smyrna and to Pergamum and to Thyatira and to Sardis and to Philadelphia and to Laodicea."
saying,
"Write in a book what you see
The trumpet-like voice behind John tells him to "Write a book (this Revelation) of what he sees. He includes throughout what he hears; but it should not be mistaken that this is coming from John's imagination. It isn't. He actually saw it while in the Spirit.
At the end of Revelation, John testifies/verifies that he did as told - Revelation 22:18-19 .
On a philosophic note: This book concludes the existence of mankind not unlike Moses' book, Genesis, is a book of the beginning of mankind -
and send it to the seven churches:These churches really existed in John's day. They are located on the mainland to the northeast of the isle of Patmos. John apparently had ministered to each of them, perhaps in the order given here. It is interesting to note that the first three chapters of Revelation and verse 4:1 apply to the Church Age. Study each church in the following chapters for their shortcomings and successes. Do each of these typify a type of church today?
to Ephesus and
to Smyrna and
to Pergamum and
to Thyatira and
to Sardis and
to Philadelphia and
to Laodicea."
References to the Revelation of Jesus Christ are in bold italics. All other references are in bold only.