1- What is the ruling on the persistence of the color trace of impurity—such as urine or feces—on clothing after washing it many times? 2- Is it permissible to act upon the Hadith: "He should not depart until he hears a sound or perceives a smell" when feeling air bubbles coming out of the anus during ablution and prayer without hearing a sound or perceiving a smell?
The persistence of traces of impurity after making an effort to wash and purify them is excused to alleviate hardship. If it is confirmed that bubbles have exited, they invalidate ablution (wudu') and nullify prayer (salat), unless this occurs repeatedly and re-purification and prayer become difficult, in which case the person becomes one of those with an excuse.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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