Ruling 670 — Purification (Ṭahārah)

If someone performs tayammum due to shortage of time and after the prayer he is able to perform wuḍūʾ but does not, and now he does not have the water he had previously, in such a case, if his duty now is to perform tayammum, he must perform tayammum again for subsequent prayers even if he has not done anything that invalidates tayammum.