AbdurRahman ibn AbuUqbah quoted his father AbuUqbah who was a client from the people of Persia as saying: I was present at Uhud along with the Messenger of Allah (ﷺ), and on smiting one of the polytheists I said: Take this from me who is the young Persian. The Messenger of Allah (ﷺ) then turned to me and said: Why did you not say: Take this from me who is the young Ansari?
Sunan Abi Dawud Book 43, Hadith 351