Who said what larks Pip?

The quote "Who said what larks Pip?" is from the novel "Great Expectations" by Charles Dickens. It is spoken by the character Miss Havisham to the protagonist, Pip. Miss Havisham is referring to the song "The Lark in the Clear Air", which is a traditional English folk song. The song begins with the line "Who said what larks?" which is what Miss Havisham is quoting.