"Our forefathers have handed down to us the tradition, that, after the Lord’s ascension, when, through the coming of the Holy Ghost, tongues of flame had settled upon each of the Apostles, that they might speak diverse languages, so that no race however foreign, no tongue however barbarous, might be inaccessible to them and beyond their reach, they were commanded by the Lord to go severally to the several nations to preach the word of God. Being on the eve therefore of departing from one another, they first mutually agreed upon a standard of their future preaching, lest haply, when separated, they might in any instance vary in the statements which they should make to those whom they should invite to believe in Christ. Being all therefore met together, and being filled with the Holy Ghost, they composed, as we have said, this brief formulary of their future preaching, each contributing his several sentence to one common summary: and they ordained that the rule thus framed should be given to those who believe."
January 1, 1970
https://en.wikiquote.org/wiki/Tyrannius_Rufinus