Musannaf Ibn Abi Shaybah 35828 — Using one's kunyah in war

Sayyiduna Abu Uqbah (may Allah be pleased with him) said: I took part with the Messenger of Allah (peace and blessings be upon him) in the Battle of Uhud. I struck one of the idolaters with my sword, saying, "Take this, I am the Persian youth." News of this reached the Prophet (peace and blessings be upon him), and he said, "Why did you not say, 'Take this blow from me, I am the Ansari youth'?"