Try Gombrich What the Buddha Thought, pg. 29-30.
There are other references to "five fire wisdom" in the index,
but less info or references than desired (a general problem
with this whole book, in my opinion).
There are a couple of references in Jurewicz, too,
if you have a copy.
My recently moved Blog, containing some of my writings on the Buddha Dhamma, as well as a number of translations from classical Buddhist texts and modern authors, liturgy, etc.: .