Imam al-Shafi'i (may Allah have mercy on him) said: "I do not know of any opponent who disputes that the Messenger of Allah (peace and blessings be upon him) ruled the diyah (blood money) to be upon the 'aqilah (the killer's paternal kinsmen, the 'asabah); and this (is so well known among the general public that it) is more than a hadith narrated by particular individuals, and we have also mentioned it from the hadith narrated by particular individuals."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / Q16367