Christian writer Papias of Hierapolis, c. AD 95–109 ("Matthew compiled the oracles (logia) of the Lord in a Hebrew manner of speech, and everyone translated them as well he could")[13] as evidence of a separate source. Rather than the traditional interpretation—that Papias was referring to the writing of Matthew in Hebrew—Schleiermacher proposed that Papias was actually referring to a sayings collection of the apostle Matthew that was later used, together with narrative elements, by another "Matthew" and by the other Evangelists.

Papias of Hierapolis

https://en.wikipedia.org/wiki/Q_source

https://en.wikipedia.org/wiki/Papias_of_Hierapolis