Luke's longest quotation is of Isa 40:4–5 in Luke 3:4–6. It corrects and extends Mark 1:2–3's amalgamated "misquotation" of Isa 40:3, Exod 23:20, and Mal 3:1.
Matthew's second-longest quotation is of Isa 6:9–10 in Matt 13:14–15. It paraphrases then extends Mark's wonky version.
Matthew's second-longest quotation is of Isa 6:9–10 in Matt 13:14–15. It paraphrases then extends Mark's wonky version.
The quotation in Luke 3 is 17 words longer than any other in the Third Gospel. It's also three times longer than Luke's average quote.
The quotation in Matt 13 is a rare instance in which the author follows the LXX nearly verbatim.
The quotation in Matt 13 is a rare instance in which the author follows the LXX nearly verbatim.
Theory: Matthew and Luke notice intertextual tomfoolery in their predecessor, check it against a manuscript (rather than work from memory), and extend the quotation.