Papias and Q
Papias of Hierapolis (c 60 - 130 AD) was an Early Christian Bishop of Hierapolis in Anatolia, whose book, "Expositions of the Oracles of the Lord", in which he stated that "Matthew compiled the logia (τὰ λόγια) in the Hebrew language, and each person interpreted them as he was able", survives only in quotations made by Irenaeus and Eusebius.
As stated above, some scholars identify the work that Papias attributed to Matthew with the hypothetic Q document that would explain the many similarities between the Gospel of Matthew and the Gospel of Luke that are not accounted for in the presumedly earlier Gospel of Mark.
Read more about this topic: Logia