Sunan An-Nasa'i

It was narratd that Sahl bin Abi Hatmah said:""Abdullah bin Sahl and Muhayysah bin Mas'ud bin Zaid went to Khaibar, and at that time there was a peace treaty. They went their separatea ways to go about their business, then Muhayysah came upon 'Abdullah bin Sahl lying dead in a pool of blood. He buried him, then he camae to Al-Madinah. 'Abdur-Rahman bin Sahl and Huwhayysah, and Muhayysah, the tow sons of Nas'ud, came to the Messenger of Allah, and ""Abdur-Rahman started to speak, but the Messenger of Allah said: ""Let the elders speak first,"" for he was the youngest of them. So he fell silent and they (the other two) spoke. The Messenger of Allah said: ""Will you sear fifty oaths, then you will receive compensation or be entitled to retaliate?"" They said: ""O Messenger of Allah, how can we a wear and oath when we did not witness and did not see (what happened)"" He said: ""Then can the Jews swear fifty oaths declaring their innocence?"" They said: ""O Messenger of Allah, how can we accept the oath of a disbelieving people?"" So the Messenger of Allah paid the blood money himself