I figured that the book referenced was the Book of Revelations because of the "white horse" in later lines. The first of the four horsemen, Pestilence, rides a white horse according to Revelations and is the first seal, a harbinger of the oncoming apocalypse. Angels, such as Gabriel, are also said to herald the coming of end which is what I interpreted the bell ringing as.
I figured that the book referenced was the Book of Revelations because of the "white horse" in later lines. The first of the four horsemen, Pestilence, rides a white horse according to Revelations and is the first seal, a harbinger of the oncoming apocalypse. Angels, such as Gabriel, are also said to herald the coming of end which is what I interpreted the bell ringing as.