Musannaf Ibn Abi Shayba 18:872

Abu Bakr narrated to us, he said: Waki' narrated to us, he said: Sharik narrated to us, from Ghaylan ibn Jami' al-Muharibi, from Abu 'Awn al-Thaqafi, from Shurayh, who said: There is no liability upon the one who provides medical treatment.