Does impurity spread, and must the color of the water be changed when purifying a staircase on which a dog has defecated, if the cleaner removed the feces and submerged the staircase with water two or more times, knowing that a small amount of water does not become impure unless its characteristics change?
Merely immersing the impurity in water is sufficient for its purification. It is not a condition for the impurity of a dog on the ground to wash it seven times or to use earth, nor is it a condition to scrape off the spot where the dog defecated. One must also beware of succumbing to obsessive whispers (waswas).
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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