Narrated to me by the Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, who said: Ahmad bin Muhammad bin Al-Hasan narrated to me, from his father, from Muhammad bin Al-Hasan, from Ahmad bin Muhammad and Al-Husayn bin Al-Hasan bin Aban, from Al-Husayn bin Sa'id, from Uthman, from Sama'ah, who said: I asked Imam عليه السلام about urinating in running water. Imam عليه السلام said: 'There is no harm in it.'