Performing tayammum with soil, pebbles, a clod of earth, and stone is valid. However, the recommended precaution is that if it is possible to perform tayammum with soil, one should not perform it with any other thing; and if soil is not available, [the recommended precaution is to perform tayammum] with fine sand that is very soft, such that it can be called ‘soil’; and if that is not possible, with a clod of earth; and if that is not possible, with pebbles; and in the event that pebbles and a clod of earth are not available, one must perform tayammum with a stone.