Muhammad ibn Ahmad ibn Yahya, from Ibrahim ibn Ishaq, from Muhammad ibn Sulayman Al-Daylami, from his father, who said: I asked Abu Abdullah عليه السلام about a well that is located near a toilet. Imam عليه السلام said to me: "The flow of all underground water follows the direction of the north wind. If the clean well is situated above the north and the toilet is below it, then it does not harm the well as long as there is a specified distance between them. And if the toilet is above the clean well, then the distance should not be less than twelve cubits. However, if the toilet is directly opposite the well, facing the Qiblah, and they are at the same level along the path of the north wind, then the distance should be seven cubits."