سنن النسائي

It was narrated from 'Amr bin Shu'aib, from his father, from his grandfather, that: the younger son of Muhayysah was found slain one morning at the gate of one morning at the gates of Khaibar. The Messenger of Allah (ﷺ) said: "Bring two witnesses to (say) who killed him, and he will hand him over to you." He said: "O Messenger of Allah, where shall I get two witnesses? He was found slain in the morning at their gates." He said: "Will you swear fifty oaths?" He said: "O Messenger of Allah, how can I swear concerning something I do not know?" The Messenger of Allah (ﷺ) said: "Then will you accept fifty oaths from them?" He said: "O Messenger of Allah, how can we accept their oaths when they are Jews?" So the Messenger of Allah (ﷺ) told them (the Jews) to pay the Diyah and he would help them with half."