called Eusebius (263-339 CE) wrote in “The History of the Church”, translated by GA Williamson (1965), page 152, book 3, chapter 39 “The Writings of Papias” near the very end of that chapter, he declares that the same Matthew of the Gospel of Matthew had “compiled” a book of “Saying” (oracles) [ which would be the missing Q source ] written in Aramaic and said Eusebius – that everyone translated from those “Sayings” [of Christ].

This is interesting about these ancient writings. In the introduction to his translation of the Bible (1934) James Moffatt writes,

[the writer of Matthew’s gospel] rearranged and often rewrote Mark’s gospel, omitting a little, altering much, and adding more, from special Palestinian sources. The new material, as far as it embodied sayings, is often drawn from Q: indeed, it is a fair hypothesis, although not more than a hypothesis, the Q was compiled by Matthew, one of the original disciples of Jesus, and that the entire gospel was associated with the name of Matthew on account of the thoroughness with which this Matthian source (= Q) was for the first time incorporated in a gospel.