This volume is the first in a proposed series of commentaries on the ‘Apostolic Fathers’, edited by Paul Foster, Andrew Gregory and Christopher Tuckett. Two further works are scheduled to appear shortly: Paul Hartog on the epistle and martyrdom of Polycarp and Clayton Jefford on the epistle to Diognetus. Like the volumes that have so far appeared in the Oxford Early Christian Gospel Texts series, contributions to the new series are formatted like a conventional commentary with introduction, text and notes, although the text is printed continuously so that these works can also function as critical editions. English-language commentaries on the texts covered in the two series are few and far between, in consequence of the overwhelming emphasis of the canonical literature in both teaching and research, and the fact that important non-canonical texts are now receiving commentary-like, monograph-length treatment will be warmly welcomed by those scholars who recognise that the second century is an indispensable resource for understanding the first. Thus 2 Clement is particularly important for the insights it offers into the early transmission of Jesus' sayings; Christopher Tuckett devotes close attention to this issue, providing a detailed examination of relevant ‘parallels’ at the start of his discussion of each chapter. As Tuckett notes, the citations of what ‘the Lord says’ indicate at least an indirect knowledge of Matthew and Luke, but also of unknown non-canonical sources. There is as yet no clear gospel canon, although the assumption that the Lord's sayings must be accessed in written form is by now well established. Scholarly attempts to reconstruct a single lost source for the sayings material are, however, rejected, as are a number of other speculative historical hypotheses in the course of Tuckett's commentary. Indeed, an insistence on clear demarcations between the probable, the possible and the unknowable is evident throughout. This caution is no doubt appropriate: especially in the case of a little-studied text such as this, the emphasis should be on balance and comprehensiveness rather than a one-sided originality. Such comprehensiveness is also exemplified by the textual apparatus, in contrast to the selectivity of the older and newer Loeb editions. In 2 Clement i, for example, Tuckett offers fourteen variants to Bart Ehrman's four. In sum, this volume sets an impressively high standard for those that are to come. Hopefully the new series will encourage New Testament and patristic scholars alike to extend the range of the early Christian literature with which they are prepared to engage.