The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, narrated to me from Ahmad ibn Muhammad, from his father, from al-Husayn ibn al-Hasan ibn Aban, from al-Husayn ibn Sa'id, from Uthman ibn Isa, from Sama'ah, from Abu Abdullah عليه السلام, who said: I asked Imam عليه السلام about a man passing by water in which a dead animal has decayed and caused a stench. Imam عليه السلام said: "If the stench dominates the water, then he should neither perform Wudu' (ablution) with it nor drink from it."