Rules regarding Fāqid al-Ṭahūrayn
Issue No.639- If the things which were mentioned in the previous issue are not found, he should do tayammum on dust which settles on the clothes, etc., and if it is not found either, he should do tayammum on mud. And if none of these things is available he should, on the basis of obligatory precaution, perform prayer without tayammum, and later on should perform the prayer as qaḍā; such a person is called “Fāqid al-Ṭahūrayn”, i.e., one who lacks both water and earth or suchlike on which tayammum is allowed.
