10. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Ali ibn al-Hakam from abu al-‘Aziz al-Nakhkhas who has said the following: “I once said to abu ‘Abd Allah , ‘I deal with animals. Some times I go out during the night, and animals may have urinated and dunged and they spread it with their legs which pollutes my clothes; and in the morning I find the marks.’ He (the Imam) said, ‘You are not required to do anything.’”