The Shaykh narrated from Abu Al-Qasim Ja‘far bin Muhammad, from his father, from Sa‘d bin Abdullah, from Ahmad bin Muhammad, from Al-‘Abbas, from Muhammad bin Abi Umayr, from Hammad bin ‘Uthman, from Abu Abdullah عليه السلام, who said: Imam عليه السلام said: "There is no harm in performing the wiping (for ablution) both forward and backward."