"Beware of the two things that bring curses (41)." They asked: "What are the two things that bring curses, O Messenger of Allah?" He said: "The one who relieves himself in the path of the people, or in their shade." Recorded by Muslim (42). A mawrid (water source) is a path.

He should not urinate under a fruit-bearing tree when it is bearing fruit, so that the fruit does not fall upon him and become defiled by it. As for when it is not bearing fruit, there is no harm in it, for the Prophet, peace and blessings of Allah be upon him, preferred [to use for concealment when relieving himself] (43) a mound or a grove of palm trees. He should not urinate in standing water, because the Prophet, peace and blessings of Allah be upon him, forbade urinating in stagnant water. It is agreed upon (44), and because if the water is small in quantity, it renders it impure (45), and if it is large, it may change due to repeated urination in it. As for running water, it is not permissible to defecate in it, because it harms those who pass by it. If one urinates in it and it is a large body of water that is not affected by the urine, there is no harm; for the fact that the Prophet, peace and blessings of Allah be upon him, specified stagnant water with the prohibition against urinating in it is evidence that running water is the opposite. He should not urinate on anything that has been forbidden to use for istijmar (cleaning oneself with stones), because this is more severe than istijmar, so the prohibition there serves as an alert to the prohibition of urinating upon it. It is disliked to urinate into a crack or a hole, based on what Abdullah ibn Sarjis narrated, that the Prophet, peace and blessings of Allah be upon him, forbade urinating into a hole. Recorded by Abu Dawud (46); and because one cannot be certain that there is no animal inside that might sting him, or that it is a dwelling for the Jinn, whereby he would be harmed by them. It has been narrated that Sa'd ibn Ubadah (47) urinated in a hole in the Levant, then he was found lying dead, and the Jinn were heard...