Philostorgius, Ecclesiastical History, book 1, section 8a; fragment from Nicetas, Thes. 5.7: in Philip Amidon, Philostorgius: Church History, p.11
Theophanes, 60B-61B, in Philip Amidon, Philostorgius: Church History p.221; also Sozomen; and also Socrates, HE 2, ch. 38. Theodoret does not mention the incident.