Ibn Shihab, Rabi'ah, Abu al-Zinad and Ishaq bin Abdullah (may Allah have mercy on them) say that the Prophet (peace and blessings be upon him) "did not set blood money for anything other than a bone-exposing wound; rather, he left it as something forgiven among the Muslims."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16208