Narrated to me by the Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, from Abu Al-Qasim Ja’far bin Muhammad, from his father, from Sa’d bin Abdullah, from Abu Ja’far Ahmad bin Muhammad, from Al-Husayn bin Sa’id, from Fadalah bin Ayyub and Safwan bin Yahya, from Abdullah bin Bukayr, from Hafs bin Abi Isa, who said: I said to Abu Abdullah عليه السلام: "I stepped on feces with my leather sock (khuff), and I wiped it until I saw nothing remaining on it. What do you say about praying in it?" Imam عليه السلام said: "There is no harm."