The Book of Leviathan is the fourth book of the Satanic Bible by Anton LaVey and it contains the Invocation to Satan. It is the book which Charles finds on Fabius' study at the end of the 11th chapter, "Into The Fiery Furnace".

However, the words quoted by Charles are not from LaVey's work, but from the actual Bible, Book of Joel, chapter 3, verse 9:

" [...] Prepare war, wake up the mighty men, let all the men of war draw near [...]"