Musannaf Ibn Abi Shayba 18:1256

Abu Bakr narrated to us, he said: Ibn 'Uyaynah narrated to us, from 'Amr, from Muhammad ibn 'Ali, he said: 'Uthman said: "Whoever sits with a blind person and the blind person strikes him with something, then it is *hadar* (uncompensated/void of liability)."