source for the question of the early Christian service of worship.1 In addition to these main sources in the New Testament we have at our disposal Christian literature to the year 150. This material is, for our purpose, all the more to be consulted since, particularly where a text has references to worship and liturgy, the elements attested in the text are much older than this text itself. Of these extra-canonical, early Christian documents the most important for our problem is the Didache, which