Ali ibn Ibrahim, from his father, from Hammad ibn Isa, from Hariz, from Zurarah, Muhammad ibn Muslim, and Abu Basir, who said: We said to Imam عليه السلام: "A well is used for wudu (ablution), and urine flows nearby it. Does it make the well impure?" Imam عليه السلام said: "If the well is at a higher elevation in the valley, and the urine flows below it, and there is a distance of three or four cubits between them, then nothing renders it impure. But if the well is at a lower elevation in the valley, and water flows over it, and there is a distance of nine cubits between the well and the flow, neither of them becomes impure. However, if the distance is less than that, one should not perform wudu from it." Zurarah said: "I then asked Imam عليه السلام, 'What if the flow passes right next to it and does not settle on the ground?' Imam عليه السلام said: 'As long as it does not settle, there is no harm. But if even a small amount of it settles and does not penetrate the ground or seep into the well, then the well is not affected by it. Perform wudu from it. The problem arises only if the impurity collects completely in one place and stagnates.'"