Musnad Ahmad 1077:12

'Abd al-Razzaq narrated to us, Ibn Jurayj narrated to us, Ibn Shihab narrated to me, regarding the *Qasamah* (oath-taking procedure) in cases of bloodshed, he said: The *Qasamah* was [practiced] during the Pre-Islamic period (*Jahiliyyah*). According to the narration of Abu Salamah ibn 'Abd al-Rahman and Sulayman ibn Yasar, from men among the Companions of the Prophet, may Allah bless him and grant him peace, from the Ansar: "That the Messenger of Allah, may Allah bless him and grant him peace, upheld it as it was during the Pre-Islamic period, and he judged by it between some people of the Ansar regarding a slain person whom they accused the Jews of killing."