Musannaf Ibn Abi Shayba 28:1051

Husayn ibn Muhammad narrated to us, he said: Jarir ibn Hazim narrated to us, from Muhammad ibn Ishaq, from Dawud ibn al-Husayn, from Abd al-Rahman ibn Abi Uqbah, from Abu Uqbah—and he was a freed slave from the people of Persia—he said: I witnessed the day of Uhud with the Messenger of Allah, may Allah bless him and grant him peace. I struck a man from the polytheists and said, "Take that from me, and I am the Persian youth!" This reached the Prophet, may Allah bless him and grant him peace, and he said, "Why did you not say, 'Take that from me, and I am the Ansar youth'?"