Sulayman bin Yasar (may Allah have mercy on him) reports from men of the Ansar (may Allah be pleased with them) that the Prophet (peace and blessings be upon him), beginning with the Jews, said to them: "Fifty men of you shall swear", but they refused. Then he told the Ansar (may Allah be pleased with them) to swear, and they said: "How can we swear about the unseen?" So he (peace and blessings be upon him) imposed the blood money on the Jews, because the slain man was found in their area. This narration is mursal, since the men who told them are not named, and it contradicts the connected hadith both in beginning the qasamah and in the giving of the blood money; what is established by a sound chain is that the Prophet (peace and blessings be upon him) paid the blood money from his own funds. Ibn Jurayj and others differed from him in its wording.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسامة / 16441