Narrated to me by the Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, who said: Ahmad bin Muhammad bin Al-Hasan bin Al-Walid narrated to me, from his father, from Muhammad bin Al-Hasan Al-Saffar, from Ahmad bin Muhammad and Al-Husayn bin Al-Hasan bin Aban, both of them, from Al-Husayn bin Sa'id, from Hammad, from Rabi'i, from Al-Fudayl, from Abu Abdullah عليه السلام, who said: Imam عليه السلام said: 'There is no harm in a man urinating in running water, but it is disliked to urinate in stagnant water.'