Eusebius in
Ecclesiastical History, gives evidence that it was known in his day that Matthew wrote his Gospel in Hebrew. Eusebius himself had quoted other writers, Papias (Book III, Chapter 39, page 127), Irenæus (Book V, Chapter 8, page 187), Origen (Book VI, Chapter 25, page 245), and Eusebius himself (Book III, Chapter 24, page 108).
ewtn.com/library/SCRIPTUR/NEWBOOK.TXT
The facts are that the 1964 Magisterial *Instruction on the Historical Truth of the Gospels *from the Pontifical Biblical Commission teaches concerning the Apostles:
“However there is no reason to deny the fact that the apostles, in telling their listeners about our Lord’s deeds and words, utilized the fuller understanding which they had acquired from the glorious events of Christ’s life14 and the guidance of, the Spirit of truth.15 After His resurrection Jesus Himself "interpreted to them"16 His own words and those of the Old Testament.17 In a similar manner they explained His deeds and words according to the needs of their audience.
“Devoting themselves, ‘to the ministry of the word,’18 they set about preaching, and utilized the type of presentation appropriate to their purpose and the mentality of their listeners. They were debtors19 to Greeks and to foreigners, to learned and unlearned."20 Indeed we can single out the following categories in the preaching of Christ’s heralds: catechetical formulas, narrative reports, eyewitness accounts, hymns, doxologies, prayers, and similar literary genres commonly found in Sacred Scripture and the speech of that period.”
In fact, the PBC in the 1964 Instruction warned that “There are others who have as their starting-point a wrong notion of faith, taking it that faith is indifferent to historical truth, and is indeed incompatible with it. Others practically deny a priori the historical value and character of the documents of revelation. Others finally there are who on the one hand underestimate the authority which the Apostles had as witnesses of Christ, and the office and influence which they wielded in the primitive community, whilst on the other hand they overestimate the creative capacity of the community itself. All these aberrations are not only opposed to Catholic doctrine, but are also devoid of any scientific foundation, and are foreign to the genuine principles of the historical method.”