When is tayammum invalidated?

The Shaykh : If so, tayammum is a purifier, but if water is found, the tayammum is invalidated and it becomes obligatory for him to use the water due to the previous state of ritual impurity, as per the explicit text. The Shaykh al-Islam also cited this as a consensus. Be aware that if you performed tayammum for major ritual impurity due to the absence of water, and then you were able to access it afterwards, it becomes obligatory for you to perform the full ritual bath, as in the hadith of Imran ibn Husayn, which al-Bukhari narrated at length, that the Messenger of Allah (peace and blessings be upon him) saw a man sitting apart from the group without praying. He said: Then they found water and the people drew from it, and some remained. So the Messenger of Allah (peace and blessings be upon him) said to the man whom he had ordered to perform tayammum for his major ritual impurity: So he took it and poured it over himself. This is clear evidence that if a person performs tayammum for major ritual impurity due to the absence of water and then finds water, it becomes obligatory for him to perform the full ritual bath. Likewise, if he performed tayammum due to illness and then recovered from his illness, it becomes obligatory for him to perform the full ritual bath for the previous major ritual impurity.