Revelation 1:18-20

18and the Living one; and I was dead, and behold, I am alive for evermore, and I have the keys of death and of Hades. 19Write therefore the things which thou sawest, and the things which are, and the things which shall come to pass hereafter; 20the mystery of the seven stars which thou sawest in my right hand, and the seven golden candlesticks. The seven stars are the angels of the seven churches: and the seven candlesticks are seven churches.