Al-Zuhri (may Allah have mercy on him) said: In the time of the Messenger of Allah (peace and blessings be upon him), in the time of Abu Bakr al-Siddiq (may Allah be pleased with him), and in the time of Umar and Uthman (may Allah be pleased with them both), the diyah (blood money) of a Jew and of a Christian was the same as that of the Muslims. When the era of Sayyiduna Mu'awiyah (may Allah be pleased with him) came, he gave half to them (the family of the slain) and deposited half in the public treasury. Then Umar bin Abd al-Aziz (may Allah have mercy on him) ruled for the half (to the family) and dropped what Mu'awiyah had assigned (to the treasury). Imam al-Shafi'i (may Allah have mercy on him) rejected this narration because it is mursal, since al-Zuhri's mursal reports are bad (qabih al-mursal); and we have narrated from Umar and Uthman (may Allah be pleased with them both) what is more authentic than it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16354