Musannaf Ibn Abi Shaybah 35831 — Using one's kunyah in war

Qays bin Abi Hazim said: On the day of the Battle of al-Qadisiyyah we were in ranks, and Sayyiduna Amr bin Ma'dikarib (may Allah be pleased with him) passed by us and said, "O young men of the Arabs! Be tough lions, for the lion is the one who gives sufficiency. And the Persians are like a billy-goat once they have thrown their short spears."