Narrated to me by the Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, from Ahmad bin Muhammad, from his father, from Sa’d bin Abdullah, from Ahmad bin Muhammad, from Salih, from Al-Sakuni, from Muhammad bin Abi Umayr, who said: I said to Abu Abdullah عليه السلام: "Can I pray on a rug (shadhakwanah) that has been affected by janabah (ritual impurity)?" Imam عليه السلام said: "There is no harm."