Sahih Muslim
The Book Pertaining to the Oath, for Establishing the Responsibility of Murders, Fighting, Requital and Blood-Wit (Kitab Al-Kitab Al-Qasama wal-Muharaba wal-Qisas wal-Diyat)
Book Number: 016 / Hadith Number: 4128
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