Dialogue 3.2.2-8
The first thing that I [i.e. Gallus] am anxious to tell is a story that Refrigerius whispered in my ear.
There follows a description of a miracle which took place in Chartres in the presence of bishops Valentius and Victricius.
If, perhaps, this seems to inceredible to anyone, Evagrius, who is present, will offer testimony that this is a true story, for he was there when the deed was done.
(trans. Goodrich 2015: 231-232, summarised by J. Szafranowski)