Sa’d ibn Abdullah narrated from Ahmad, from his father, from Abdullah ibn Al-Mughira, from Rifa’a, from Abu Abdullah عليه السلام, who said: Imam عليه السلام said: "If the ground is wet and there is neither dust nor water, then look for the driest spot you can find and perform tayammum from it, for this is an allowance from Allah سبحانه وتعالى, the Mighty and Majestic." Imam عليه السلام continued: "If he is in snow, let him look for the saddle pad of his mount and perform tayammum from its dust or anything dusty. And if he is in a situation where he finds nothing but mud, then there is no harm in performing tayammum with it."