8. My father said: `Abd Allah ibn Ja`far al-Himyari said, on the authority of Ahmad ibn Muhammad ibn `Isa, on the authority of al-Hajjal, on the authority of Tha`labah ibn Maymun, on the authority of `Abd al-A`la ibn A`yun that I asked Abu `Abd Allah al-Sadiq whether a person who knows nothing has any responsibility. He replied, “No.”