Dear Peter,
I seem to remember that such metaphors already occur with Ephrem of Nisibis, but I'm not entirely certain. A quick look at the following article or at some publications by Flavia Ruani on the topic of Ephrem's writings against the Manichaeans would probably answer that question.
Cassingena-Trévedy, François, ''L’usage de la métaphore dans le discours hérésiologique d’Éphrem de Nisibe'', Pages 87-108 in Les Pères de
l'Église et les dissidents: Dessiner la communion. Disssidence, exclusion et réintégration dans les communautés chrétiennes des six premiers siècles. Actes du IVe colloque de la Rochelle, les 25, 26 et 27 septembre 2009.
Edited by Delage, Pascal-Grégoire. Caritas Patrum. Paris: Cerf, 2010.
Best wishes,
Andy
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