Where in To Kill a Mockingbird does it mention that Mr. Dolphus Raymond is a "fine folk"? Where is the quote or where is it mentioned in the book...

I don't believe there is a direct quote in To
Kill a Mockingbird that calls Dolphus Raymond "fine folk" (or "fine folks").
Nor does Calpurnia ever refer to anyone specifically as "fine folks." The only reference
to "Fine Folks" comes in Chapter 13 when Scout compares her definition of the term with
that of her Aunt Alexandra's.

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I had received the impression that Fine Folks
were people who did the best they could with the sense they had, but Aunt Alexandra was
of the opinion... that the longer a family had been squatting on one patch of land the
finer it was. 

Dolphus
Raymond would certainly fit the term under Alexandra's definition, although few people
in Maycomb would actually call Raymond "Fine Folks." Jem also recognized that the Ewells
would also be fine folks, since they had lived in Maycomb for at least three
generations.