 At the end of the fourth century the "Didascalia" was used as the basis of the first six books of the "Apostolic Constitutions".At the end of the 4th century it is quoted in the Pseudo-Chrysostom's "Opus Imperfectum in Matthaeum".But the "Didascalia" never had a great vogue, and it was superseded by the Apostolic Constitutions.