Chapter on Purifying Water From Impurities

The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, narrated to me from Ahmad ibn Muhammad, from his father, from Sa'd ibn Abdullah, and Muhammad ibn Al-Hasan, from Ahmad ibn Muhammad, from Al-Husayn ibn Sa'id, from Abdullah ibn Bahr, from Ibn Muskan. He said: Abu Basir narrated to me that he asked Abu Abdullah عليه السلام about a person in a state of major ritual impurity (junub) who enters a well and performs ghusl in it. Imam عليه السلام said: "Seven buckets must be drawn from it." And I asked Imam عليه السلام about feces that fall into the well. Imam عليه السلام said: "Ten buckets must be drawn from it. If it dissolves, then forty or fifty buckets must be drawn."