Sahih Muslim Book 016, Hadith Number 4128.

Chapter : Al-Qasamah.

This hadith has been narrated on the authority of Ibn Shihab with the same chain of transmitters but with this addition: "Allah's Messenger (may peace be upon him) decided (according to Qasama) between the persons of Ansar (and yours) about a slain (Muslim) for which they made claim against the Jews