“... These and other examples of uniquely Matthean material (the "M" material) are especially intriguing since some of the M passages may be Matthew's own redactional creations. For example, in Chapter 15, Matthew inserts into Mark's dispute story on clean and unclean (Mark 7:1-23) what is apparently Matthew's own redactional observation on the Pharisees: "Every plant that my heavenly Father has not planted will be rooted out" (Matt 15:13). Saying 40 therefore sounds suspiciously Matthean when, after a warning about Pharisees and scribes (paralleled in Matt 23:13/Luke 11:52) and after the uniquely Matthean aphorism about snakes and doves, it has Jesus say: "A grapevine has been planted outside the Father. And because it is not sound, it will be plucked up by its roots and destroyed." [...] In sum, only one of the passages I have listed would have to be Matthew's own creation or reflect Matthew's redaction to prove beyond a doubt that Thomas knows and uses Matthew's Gospel to compose his own. I think that at least Matt 15:13 and 13:24-30 do exactly that. ...”