Mark combines the introductory phrases from both Matthew and Luke. Also, if Markan, why does Luke consciously choose a different way of saying it when he has both Mark and Matthew available?
This is one of those Matthean-Lukan agreements vs. Mark. I’ll get into the data (note: just the data, I won’t propose any solution here - for now) later. For now, let’s tackle the Fathers first.
But were the writings of Papias that wide spread to be considered a single source for this information? St Irenaeus is thought to have known St Polycarp a disciple of St. John and friend of St. Ignatius, and he recounts the same order.
This is going to be a bit long, but:
The relevant passage Papias survives only in a quotation from Eusebius. Papias himself doesn’t explicitly identify which gospel was written first, although the way Eusebius quotes him, it seems that Papias described the circumstances of the composition of Mark’s gospel first before he described Matthew compiling the sayings of Jesus “in the Hebrew dialect/language.”
The Elder used to say: Mark, in his capacity as Peter’s interpreter, wrote down accurately as many things as he recalled from memory—though not in an ordered form—of the things either said or done by the Lord. For he neither heard the Lord nor accompanied him, but later, as I said, Peter, who used to give his teachings in the form of
chreiai (a sort of brief anecdote about a particular person; could also sometimes be as short as a single statement by said person), but had no intention of providing an ordered arrangement of the logia (‘sayings’, ‘oracles’) of the Lord. Consequently Mark did nothing wrong when he wrote down some individual items just as he related them from memory. For he made it his one concern not to omit anything he had heard or to falsify anything.
…] Therefore Matthew put the
logia in an ordered arrangement in the Hebrew language, but each person interpreted them as best he could.
There are actually a minority of scholars who think that Papias actually had Markan priority in mind here. The most recent of these is Francis Watson, who argues in his book
Gospel Writing: A Canonical Perspective that Papias actually testifies to something like the Farrer-Goulder theory (Mark first followed by Matthew and then Luke, no Q).
Note Papias’ statements: “Mark …] wrote down accurately as many things as he recalled from memory—
though not in an ordered form—of the things either said or done by the Lord. …] Peter …] used to give his teachings in the form of
chreiai,
but had no intention of providing an ordered arrangement of the sayings of the Lord.” Which is then followed by: “
therefore Matthew put the sayings in an ordered arrangement in the Hebrew language.” As per Watson’s reading, according to Papias, Mark, Peter’s “interpreter,” recorded the latter’s recollections of Jesus, which became our canonical gospel of Mark. In Papias’ opinion, however Mark’s gospel was deficient in a way: it was “accurate” (because Mark wrote everything he had heard from Peter faithfully, or so say Papias), but it was “not in an ordered form.”
This is where Matthew comes in: in Watson’s reading, Papias claimed Matthew improved upon Mark’s ‘disorderly’ gospel by putting “in an ordered arrangement” the
logia or sayings of Jesus (Watson thinks the word
oun ‘so, therefore’ when the topic shifts from Mark to Matthew is key, implying Matthew wrote
after Mark), and later gospel writers, in turn, used (‘interpreted’?) it for their gospels. (Luke claims in his prologue that he has written “an orderly account;” was it a light stab at the more ‘disordered’ gospels that preceded him and which he may have used?)