Narrated from him, from Al-Hasan ibn Ali, from Ahmad ibn Hilal, from Ahmad ibn Muhammad, from Aban ibn Uthman, from Zurara, from one of the Imams عليه السلام, who said: I asked: "A man enters a thicket where there is no water, but there is mud. What should he do?" Imam عليه السلام said: "He performs tayammum because it is the permissible sa’eed (pure earth)." I said: "What if he is riding and unable to dismount due to fear, and he is not in a state of wudu?" Imam عليه السلام said: "If he fears for his life from a beast or something else, and fears missing the time (of prayer), then let him perform tayammum by striking his hands on the saddle pad (libd) or saddle cloth (bardha'a), and he performs tayammum and prays."