Sahih Muslim
The Book on Government (Kitab Al-Imara)
Book Number: 020 / Hadith Number: 4647
The tradition has been narrated through a different chain of transmitters on the authority of Abu Qatada who said: A man came to the Messenger of Allah (may peace be upon him) while he was on the pulpit and said: Do you think if I am killed in the way of Allah... (except this difference in its beginning, the rest of the tradition is the same as the previous one).