The passage is from Book III of Theophylact Simocatta's history: "And so Philippicus had learned during his journey that Priscus had been accredited as general by the emperor (Maurice); on reaching Tarsus he composed messages to Heraclius the Elder which indicated that, after leaving the army, he should return to his own city when he came to Armenia, and surrender the army to Narses, the commander of the city of Constantina." (Whitby & Whitby 1986, p. 72) Whitby, Michael; Whitby, Mary (1986). The History of Theophylact Simocatta. Oxford: Clarendon Press. ISBN978-0-19-822799-1.
Kaegi 2003, p. 21: "Although the achievements of his father, Heraclius the Elder, were modest, later historians magnified his military achievements as part of their program to exalt and praise his son." Kaegi, Walter Emil (2003). Heraclius: Emperor of Byzantium. Cambridge: Cambridge University Press. ISBN0-521-81459-6.
rbedrosian.com
Robert Bedrosian, Sebeos's History (1985 Translation), Chapters 6–7.