'Seven Churches' in the Bible

From John, to the seven Churches which are in Roman Asia. Blessing and peace be yours from him who is, and who was, and who shall be, and from the seven Spirits that are before his throne,

It said-- 'Write what you see in a book and send it to the seven Churches, to Ephesus, Smyrna, Pergamus, Thyatira, Sardis, Philadelphia, and Laodicaea.'

the mystic meaning of the seven stars which you saw in my right hand, and the seven golden lamps. The seven stars are the Angels of the seven Churches, and the seven lamps are the seven Churches.