Question: If one, though there is a well, is unable to extract water from it and does tayammum and performs salat and then obtains means to extract water from it, will one have to repeat that salat?

When he sees water, his tayammum becomes invalid. He must say the salam immediately and break off salat. He must make wudu' with water before the time for that salat expires and repeat it. (Radd-ul-mukhtar)

If a person is present at such a place where neither water nor any earthen object is available for Tayammum, he should perform all acts of Salah within that Salah timing without making intention for Salah. ( Bahar-e-Shariat, pp. 353, vol. 1) On having access to water or earthen object, that Salah will have to be offered after performing Wudu / Tayammum. She can do tayammum if it seems probable that she may fall. Similarly, if the use of water is likely to cause a disease when it is cold, even a healthy person is allowed to do tayammum instead of ghusl. All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.

Question: If using water for ghusl causes worsening of a disease and a delay in recovery, is it permissible to do tayammum instead of it? Question: When on night duty, I sleep in a room used as a masjid. I have to go out of it very often. Do I have to perform wudu' every time before I step into this room? Water • Ground • Sun • Istihala (Transformation) • Transfer (Intiqal) • Inqilab (fiqh) • Islam • Subjection (Taba'iyya) • Removal of Najis • Istibra of an animal which eats najis • Disappearance of a Muslim • Draining of blood from the slaughtered animal If they need to perform Tayammum, they have to perform it with clean earth. Allah (Exalted be He) says (what means):

When one is unable to find clean water to perform wudu' or ghusl (it is always fard [obligatory] to search for water when one is in a city), The method of Tayammum in place of Wudu and Ghusl is same. (Al-Jauharat-un-Nayyirah, pp. 28, vol. 1) When there is sufficient water, but we can’t use it, due to disability, or fear for our safety, honour, or our belongings.