One Who Knows That Using Water Is Harmful
Issue No.627- If someone performs tayammum because he is sure water will be harmful for him, but realises before prayer that it is not harmful, his tayammum is void, and if he has offered prayer with it, he should offer the prayer again, as an obligatory precaution. However, if he was sure that water was not harmful for him and performed wuḍū or ghusl, and then found out that water was harmful, his wuḍū is valid.
