Musannaf Ibn Abi Shayba 18:132

Abu Bakr narrated to us, he said: Muhammad ibn Bakr narrated to us, from Ibn Jurayj, from Ibn Abi Najih, from Mujahid, who said regarding the nose: "In it is one-third of the blood money (diyah). And if the tip of the nose (arnabah) or other parts of it are injured, as long as it does not reach the bone, then it is according to the proportion of the nose."