The Church
There are in the book of Revelation the mention of 7 individual Churches.
John was told to write down what he saw and to send them to the seven churches at Ephesus, Smyrna, Pergamos, Thyatira, Sardis, Philadelphia, and finally Laodicea. Each represent a physical church but also represents Church ages. And since Revelation is a book of prophecy and that each church is given instructions by the Lord himself! I believe that they are also instructions to us as the Church which is the body of Christ. Laodicea is the seventh church, also known as the lukewarm church. As Aineo stated that Jesus mentioned how he had sent his angel to testify unto the churches, so the church is mentioned in the book of Revelation. Correct me if I am wrong!