Dialogue 2.2.1-2
On the same day - I am about to tell you something amazing - when he was blessing the altar, as is customary, we saw a sphere of fire shining around his head, and as the flame climbed toward heaven, it produced a long tail of fire. And although we saw this happen on an important feast day among a great throng of people, only one virgin, one presbyter, and three monks saw [what happened]. I am not able to judge why the others did not see it.
(trans. Goodrich 2015: 213, changed by J. Szafranowski)