A leaf from P.Mich.inv. 6238 (P46) showing the end of Romans and the beginning and title of Hebrews |
"What now appear only as variant readings in the text originally were, I suggest, comments in the margins about the text—the earliest “commentary” (in the sense of activity, rather than genre) on the text of Romans." (Holmes pg. 205)
Though Holmes gave no examples from antiquity, there are two instances in which an ancient author mentions this phenomenon occurring during the copying of a text.
The second century physician Galen in his commentary on Hippocrates "Epidemics" gives two explanations for a corruption in the text of Hippocrates. The first explanation Galen gives is that Hippocrates gave a parenthetical statement in order to point out the difference between two types of patients currently being discussed in the work. Galen makes the following comment for the second.
“The other explanation is something you often observe in many books: we sometimes write two expressions for the same thing, putting it in two different ways, and place one of them in the text body and the other in the margin of the book so as to pick the better of the two at leisure when we want to edit the book. It seems that Hippocrates did the same in this place. The first editor of this book then copied both expressions together into the book’s text. We then did not look at and consider it again, pause and fix this error. Many people passed on the copy of the book, and it remained uncorrected.” (In Hipp. epid. comm. I, 1.36) (Vagelpohl pg. 167)
Here Galen describes a practice in which the author of a work gives an explanatory note in the margin of their "autograph." When the text is initially edited and copied, the scribe would think that the marginal note was meant to be entered into the text as a correction. The result is that the book was then widely copied and circulated with the error uncorrected.
Another instance of this phenomenon is mentioned by Jerome. In about 403 CE Jerome received a letter from two men asking for an explanation as to why there were so many differences between the Septuagint LXX these men were using, and the Latin Psalter Jerome had produced many years before in about 383 CE. Along with this letter, these men sent a long list of passages where there were differences in the text between the LXX and the Latin Psalter. For one of the variations in the text, Jerome gave the following explanation.
"I wonder why some rash fellow has thought that the note: “the correct form is not καταπαύσωμεν, as some think, but κατακαύσωμεν, that is, incendamus,” which was placed by me for the guidance of the reader into the margin, should be put into the body of the text." (Ep. 106.46)
Apparently, in the first edition of Jerome's Psalter he had placed an explanatory comment in the margin. A later copyist confused this entry as a correction to be entered into the body of text. Thus, all subsequent copies of his Psalter had this variation transmitted in the text.
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Corpus Medicorum Graecorum 5.10.1. English translation taken from, Galen, Commentary on Hippocrates’ Epidemics Book I: Parts I-III (Translated by Uwe Vagelpohl. Corpus Medicrum Graecorum Supplementum Orientale V1. Berlin: Walter De Gruyter, 2014).
Holmes, Michael W. “The Text of P46: Evidence of the Earliest ‘Commentary’ on Romans?” In New Testament Manuscripts: Their Text and Their World (ed. by Tobias Nicklas; Leiden: Brill, 2006) 189-206.