Pseudo-Dionysius the Areopagite
Author of the Celestial Hierarchy and other works attributed to Dionysius the Areopagite. Teaches that all divine apparitions in the Old Testament were made through angels.
Commentary on the Pentateuch of Moses
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Canons Bearing a Torch Before the Pentateuch
— Chapter 4 of the Celestial Hierarchy: all apparitions were through angels
"So Dionysius, chapter 4 of the Celestial Hierarchy"