Sadaqah bin Yasar said: We asked Ibn al-Musayyib about the diyah (blood money) of a dhimmi, and he replied that Sayyiduna Uthman (may Allah be pleased with him) ruled 4000 dirhams for it. We said: Then who (ruled) before him? So he pelted us with pebbles.
Imam al-Shafi'i (may Allah have mercy on him) said: They are the ones who asked him the second question. The opposite of this is also reported from Sayyiduna Uthman (may Allah be pleased with him) through two chains, one of which is not preserved and the other munqati' (broken); we have mentioned them (in the chapter) "A believer is not to be killed in retaliation for a disbeliever."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16339