Purity
When may I use tayammum instead of water?
Answer
When no water is available or using it would harm you, e.g. through illness. The Quran instructs striking clean earth and wiping the face and hands.
Source: Quran 4:43 · Quran 5:6
Purity
These are general explanations, not a fatwa. For your personal situation ask a qualified scholar you trust.
All questions