The ruling on one who performed tayammum for janabah and then found water
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Question:
If you performed tayammum for janabah and then found water, is it obligatory for you to perform ghusl with the water, or do you remain in a state of purity?
Answer:
If you prayed and the prayer ended, your prayer is valid, but you should use the water for the future. If water is found, let him fear Allah and let him touch it with his skin, as in the hadith. As for the prayer you performed with tayammum when you had no water on the day you prayed, your prayer is valid.
If you performed tayammum for janabah and then found water, is it obligatory for you to perform ghusl with the water, or do you remain in a state of purity?
Answer:
If you prayed and the prayer ended, your prayer is valid, but you should use the water for the future. If water is found, let him fear Allah and let him touch it with his skin, as in the hadith. As for the prayer you performed with tayammum when you had no water on the day you prayed, your prayer is valid.
Source
قناة «العلامة الدكتور صالح الفوزان»، [295 -3022] إذا تيممت من الجنابة ثم وجدت الماء فهل يجب علي الاغتسال بالماء؟ أو أنني باق على الطهارة؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.