Having unaccountably lost my copy of Batiffol’s edition of the Greek Syntagma doctrinae I looked online to see if a digital copy were obtainable (apparently, none is.)
However, I did turn up a curio from the history of scholarship, namely Dix on the question of whether Didache 1.4 which reads: ἐάν τίς σοι δῷ ῥάπισμα εἰς τὴν δεξιὰν σιαγόνα should include the word δεξιὰν. He suggests that this might not be the case on the basis of the citation of the text in Isaac of Nineveh’s Sententiae which omits the word. This is, he notes, the reading of the Diatessaron. The article is within the public domain and may be viewed at http://www.biblicalstudies.org.uk/pdf/jts/034_242.pdf.
Whereas Isaac may be a long way removed from the Didache (I recollect that, when preparing my book on the Two Ways, I decided that this text was too remote from the tradition to warrant inclusion) this was sufficient to suggest to Dix that the Didachist was indebted to the Diatessaron; this was in support of the theory (originating with Armitage Robinson and then in wide circulation) that the Didache was a product of the late second century. As part of this he has to argue that the sectio evangelica was part of the original Didache, and in this context grabs evidence from the Syntagma doctrinae which appears to cite the sectio evangelica of the Didache. On this basis, he concludes that the sectio was part of the original, and that the Diatessaronic reading is preserved by Isaac on the basis that he may have had an old text.
The basic argument of dependence on the Diatessaron and the primacy of the Two Ways Tradition as preserved in the Didache (as opposed to its representation in the Doctrina and in Apostolic Church Order) is not worth refuting. As to whether δεξιάν should be omitted from the text of the Didache at this point, quite apart from the Diatessaron, the witness of Isaac is interesting but hardly conclusive. Nonetheless, since I have just received a commission for an annotated bibliography of the Didache (to be blogged on a later occasion, I am just returning from an extended rest) it is interesting to find this curio to add to the collection, and to start the process.