Musannaf Ibn Abi Shayba 18:63

Abu Bakr narrated to us, he said: Yazid ibn Harun narrated to us, he said: Husayn al-Mu'allim informed us, from 'Amr ibn Shu'ayb, from his father, from his grandfather, from the Prophet (peace and blessings of Allah be upon him), who said: "Regarding the *mudihah* (a wound that exposes the bone), [the compensation is] five [camels]."