Opus Imperfectum in Matthaeum is an early Christian commentary on the Gospel of Matthew, written sometime in the 5th century.
[2] It exhibits a mildly Arian Christology, and represents the sometimes confused theology that permeated Christianity in its formative centuries.
It was well regarded into the Middle Ages in spite of its theological eccentricities, but fell out of widespread study after Erasmus' critique.
[4] The Auxiliary Resources Page on the Electronic Manipulus florum Project website provides a digital transcription of this text from Migne's PG 56, 611-946.
This suggests that some form of the Revelation of the Magi existed by the 5th century at the latest, so that the Opus Imperfectum could summarize it.