Abu Dawud
General Behavior
Book Number: 036 / Hadith Number: 5104
Narated By AbuUqbah : 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 Apostle of Allah (pbuh), and on smiting one of the polytheists I said: Take this from me who is the young Persian. The Apostle of Allah (pbuh) then turned to me and said: Why did you not say: Take this from me who is the young Ansari?