Musannaf Ibn Abi Shayba 18:432

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from Azhar al-Attar, from Abu ‘Awn al-Thaqafi, from Shurayh, who said regarding a hernia (al-fatq): "One-third of the blood money (diyah)."