Musannaf Ibn Abi Shayba 18:89

Abu Bakr narrated to us, he said: Jarir narrated to us, from Mansur, from al-Hakam, who said: Ali used to assign four camels for a wound that did not expose the bone (al-mudihah) but was close to doing so. And it was mentioned from al-Hakam, from Ali, the like of that.